Rough Idle

[1BOSSMAN]

I have a 2000 pontiac grand am 2.4 auto and the problem is in park and neutral idle is fine soon as i put in drive yopu can see steering wheel shake and feel it in your hands idles at 500 -600 rpms if i raise it with gas pedal to 800 rpms its fine looked on throttle body and idle screw is tamper proof

[xeroinfinity]

Idle is controled by the IAC - PCM no mechanical adjustments can be made.

Either of the two could be your problem, but I'd say its your IAC or its circuit/wires.

When you replaced the IAC did you calibrate it ?
Was the port it sets in clean through to the intake ?

I bet that's where the problem resides.

[1BOSSMAN]

Only Parts Replaced Were Coils Boots Plugs Coil Housing Fuel Pump Filters Gas Cap And Fuel Injection Cleaninghave Done Nothing With Iac

[xeroinfinity]

Sorry bout that I thought in your preveous thread you mentioned changing the IAC.

I'd check in to the IAC though
Idle Air Control(IAC) Testing Replacing

Hope that helps

[1BOSSMAN]

Yes Im Gonna Try Cleaning It Fiorst Thanks