When first fire up car it revs at 1600 rpm till it warms up. then it idles around 900. it wont let u go into gear with the clutch engaged unless its warmed up a little bit. but once u start driving it it lets u go into gear smoothly sometimes and not so smoothly on others. once u drive it for about 25 miles or so u start to notice when u let off the accelerator it will b really jerky.. after about another 5 miles it will have no acceleration in 1 2 3 gears under 2500rpm. u give it gas to get it over 2500rpm then it drives fine.. shut the car off and turn it back on and it drives fine for a block maybe and then back to the same issue. if u let it cool down all the way it will let u drive it back to the 25 mileish then act up again.. i have troubleshooted alot. cleaned mass airflow sensor changed both cat converters / egr valve new plugs - k&n air intake clutch / plate / bearings fuel filter - did not change intank sock newest symptom ... ran like a champ the last 2 days in the snow.. driving over 200 miles plus. back to **** after snow melted once the car gets full load on the ground.. many auto shops cant find the issue due to lack of being able to replicate the issue.. HELP HELP HELP HELP PLZZZ
I noticed you did a lot in trying to find the problem but I noticed that you never ran the fault codes to check for where the problem was. Run the fault codes and tell us what they were.
SOURCE: '99 chevy Silverado Z71,5.3 engine.....will not rev when hot.....
try replacing your EGR Valve, or your Oxygen Sensor
SOURCE: accelaration loss of power
I'd have a fuel pressure test done to be sure, it isn't fuel related again. Takes 5 or 10 minutes so cost should be minimal. The other thing that comes to mind is a plugged exhaust. (catalytic converter) Quite possible on a 10yr.old vehicle.
SOURCE: rough idle on 1990 saab 900 convertible, 16V
Because the car has adaptive technology, it may take a while to reset and adjust to the new, cleaner and better conditions than those to which it had previously adapted.
Did you change the cap and rotor? if the plugs needed replacement, likely they do too
Possible other causes include:
loose or corroded connections to any electrical component you disturbed (make a checklist and tick them all off as you check them);
mis-reinstallation of any F.I. part disturbed(checklist again)
obstructed water flow through the AIC valve;
improper voltage output from the AIC valve (for LH 2.4 systems, should output 8 volt at idle, dropping as load increases; for LH 2.4.2 system output 7 volt at idle etc; testing between terminals)33 and 17 at disconnected LH connector;
possible problem with MAF.
Hope this helps
Saabreur
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