Try checken throttle position sensor did one on my friends truck and fix problem hope this helps
Check the help links related to this problem.Click the link below to go through its troubleshooting procedure :-----Idles rough and quits when gas pedal
is pressed less?
http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html--------- http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html --------- After replacing brake rotors and pads,
brake pedal remains on floor?
http://technoanswers.blogspot.in/2012/02/after-replacing-brake-rotors-and-pads.html --------- accelerator pedal sensor?
http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html ------- For rough idle issues and
problem troubleshooting,go through the help links provided below :-----
van idles rough?
http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html --------- http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html ---------- http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.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 ---------- http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html --------- http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.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 ------ http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html --------- This
will help. Thanks.
Car won't start
without hitting the gas pedal?
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
-------Complete loss of brake pedal then all
gets normal?
http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
------Car dies when gas
pedal is pressed?
http://schematicsdiagram.blogspot.com/2011/12/car-dies-when-gas-pedal-is-pressed.html
--------Pushing on the gas pedal, but the car slows down? Gas pedal to
the floor and the car slows down?
will not idle when cold?
runs lean and idles rough?
Engine stumbles coming off idle when warm?
Erratic idle on car?
Low idle when cold out side?
Idle Air Control (IAC)
Valve Replacing?
Engine quits at idle?
Car overheats and Air blows
hot at idle?
While stop engine idles
like cylinder missing?
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