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Hello i have had this car now for about a 1 1/2 years it has had a rough idle since day 1.

It idles too slowly thus the vibration/rough idle.

It has been to several shops, even the caddy dealership who told me to change the plugs then the coil packs.

Done...Still rough idle.

The last mechanic who is pretty good had it hooked up to a pretty pricey looking mac reader and he said the engine was idling about 90 rpms less than it is suppose to. Also he said when the ac is turned on it doesnt speed the idle up so the roughness gets even worse.

So he says its the idle air control????

Any thoughts?

Where is it located??

I did the idle learn procedure ..it doesnt help.

There are no error codes.

Thanks for any input....

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