when i am at a stop or in park, my car idles pretty rough, and about 100rpm below normal. i have changed the plugs an wires, cleaned the IAC valce, cleaned the Throttle body, Cleaned the Throttle positioning sensor, changed most of the vaccume hoses and inspected others,ive done a torque test for the motor mounts, ive tested the fuel pressure regulator, and changed the fuel filter, brand new battery, ive done practically everything i can think of and the problem still hasnt gone away, i have 85k miles and no service lights or weird sounds...im a little lost on how to find this problem, any help or advice is greatly appreciated, thank you.01 grand am rough and low idle at stop?
The IAC valve most likely needs replacing as the cleaning will not renew worn out parts01 grand am rough and low idle at stop?
I wold check the fuel rail, I had one with the 2.4 engine and found gunk in the rail causing the same problem. Have you done a fuel pressure test? These are also notorious for the vacuum hose at the map sensor to crack causing all kinds of idle issues. Also on the 2.4's the tensioner gets weak and the chain gets loose causing it to retard 1 tooth on the exhaust, the engine will run fine under load and cruising but very rough at idle.
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