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I set it with the Engine running, hot idle, at an acceptable idle speed.

This way the idle speed never drops below your desired idle speed.

If working properly, the AIS can increase cold idle speed.

Thanks
Randy
 

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If you think the idle screw is suspect, back it off entirely.

I don't know of a factory setting other than it's never enough.

The AIC is essentially an electronically controlled vacuum leak.

There are some threads on cleaning/setting the AIC/IAC

I don't rely on them and set the idle manually with said screw.

Possibly you have a vacuum leak causing the roof top idle?

Thanks
Randy

 
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