I found this; if it helps.
The injectors need to be cleaned, if an engine is experiencing any of the classic symptoms of dirty injectors, such as lean misfire, rough idle, hesitation and stumbling on light acceleration, a loss of power, and higher hydrocarbon (HC) and carbon monoxide (CO) emissions.
Lean misfire may also trigger a misfire code and turn on the Check Engine light on 1996 and newer vehicles with OBD II systems. The code often will be a P0300 random misfire code, or you may find one or more misfire codes for individual cylinders, depending on which injectors are most affected.
the web page was:
http://www.aa1car.com/library/2003/ic30336.htm
Hope this helps
It can be issue
with IAC( idle air control valve) causing the problem.
There
are many other possibilities causing these idle issues. Engine idles rough.
There
are few help links with solutions to troubleshoot such idle issues.
I
suggest you refer the link below and follow
its troubleshooting details:------
Click
the link below:-----
-----------
http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html
------------
http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html
---------
http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html
------------------
http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html
-----------
Cold start problem and vehicle shudder around 2500 to
3500 rpms
----------
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
-----------
http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html
--------
http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html
-------------
http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html
------------
http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html
-----------
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
---------
High
Idle Problem
http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html
-------
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
---------
http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
--------
http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
-------
http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html
----------
http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html
-----------
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
---------
These
details will help.
Thanks.
Its
cold start issues:----
Go
through the list of help links mentioned below:----
Click
the link :----
Cold start problem and vehicle shudder around 2500 to
3500 rpms
----------
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
--------------
http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html
--------
http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
-----------
These
will help.
Thanks.
Its
cold start issues:----
Go
through the list of help links mentioned below:----
Click
the link :----
Cold start problem and vehicle shudder around 2500 to
3500 rpms
----------
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
--------------
http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html
--------
http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
-----------
These
will help.
Thanks.
http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
---------
Engine cuts out at 3000 RPM?
http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
---------
Cold start problem and vehicle shudder around 2500 to
3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html
---------
High rpm in neutral? Inconsistant high RPM in neutral?
http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
-----------
Jetski
Sputters and Low RPM?
http://whatisbyme.blogspot.in/2012/07/jetski-sputters-and-low-rpm.html
--------
Fuel
Injection Problem And RPM suddenly increases
http://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html
----------
2005 Toyota Highlander: Engine runs hard RPM
below 3000?
http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html
---------
1987 Toyota Camry: RPM Drops going Up hills?
http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html
-----------
Cruise
Control stops working, Excessive cranks to start the engine and RPM goes max
2500
http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html
----------
1990 Toyota 4Runner: Engine cuts off when
reaches 2000 RPM?
http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html
------------
1999 Toyota Camry: Erratic stalling and high
engine RPM at idle?
http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html
---------
1995 Toyota LS: Misfire at idle or low RPM
http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html
-----------
Lexus RX: Tapping noise under Valve Cover At Low RPM?
http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html
----------
These will help.
Thanks.
http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
---------
Engine cuts out at 3000 RPM?http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
---------
Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html
---------
High rpm in neutral? Inconsistant high RPM in neutral?http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
-----------
Jetski Sputters and Low RPM? http://whatisbyme.blogspot.in/2012/07/jetski-sputters-and-low-rpm.html
--------
Fuel Injection Problem And RPM suddenly increaseshttp://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html
----------
2005 Toyota Highlander: Engine runs hard RPM below 3000?http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html
---------
1987 Toyota Camry: RPM Drops going Up hills?http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html
-----------
Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html
----------
1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?
http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html
------------
1999 Toyota Camry: Erratic stalling and high engine RPM at idle?
http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html
---------
1995 Toyota LS: Misfire at idle or low RPMhttp://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html
-----------
Lexus RX: Tapping noise under Valve Cover At Low RPM?http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html
----------
These will help.
Thanks.
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