Need more info (what happens when you lightly press the accelerator)
SOURCE: rough idle
Have you had the throttle valve cleaned?
Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
SOURCE: ROugh idle
there are 2 things that usually cause this, one is a dirty intake idle control valve and the other is hard engine mounts, I would say that both most likely apply to your car. try cleaning the intake with the following procedure from Ford.
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
SOURCE: no check engine light on runs rough while in gear
Plug Mis-firing (firing-but not adequately) no light and no fire.
Causes: Spark plug bad, spark plug wire leaking.
If you can pull the spark plugs - and you find that one of them is wet or very dirty - compared to the others....the you have the wire/plug source identified.
SOURCE: car idles rough in park also runs rough in overdrive
Sometimes a rough idle like that is a fuel filter. As you've already done the plugs and wires the fuel filter would be my next bet.
SOURCE: 2001Pontiac Grand Am Rough Idle In Drive Only
I had the same problem with '99 GA I changed the idle control valve , solve the problem
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Hi patricia brokaw, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?Need more info (what happens when you lightly press the accelerator)
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