: 2003 cts rough/slow idle

06-25-08, 06:05 PM
Hello i have had this car for about a year now.
It has always had a rough idle. Recently i took it to a shop and he hooked it up to a real pricey mac reader and told me the idle was too slow. Around 75 rpm too slow. When you turn the air on it still has the rough idle.
He thinks its the air idle control. I have replaced both coil packs and plugs.
There are no error codes. It smooths out as sonn as you touch the accelerator.

Whats your thoughts?
Where is this air idle control?

Thanks...hope you can help