Rough Idle

[Hurricane87]

When I first start the car, it idles rough as Hell. It smooths out almost immediately afterward, and stays fine the rest of the trip. It doesn't matter if the engine id hot or cold, and there is no CEL.

 

[FordMan77]

Maybe try cleaning the throttle body inside and out and also the MAF. I've had that issue before and that fixed it up. Other than that maybe the IAC is sticking a bit.

 

[Hurricane87]

The throttle body is cleaner than my mother's reputation. So is the MAF. I know this because I just installed a CAI. Where is the IAC?

 

[SgtMarshal]

2008 pontiac grand prix GXP iac location - Google Search

 

[Hurricane87]

So, there IS no IAC. Anything else to look at?

 

[Hurricane87]

Another forum suggested looking at the EGR valve. Where is that?

 

[SgtMarshal]

it connects the exhaust to the intake manifold.