Pontiac Sunfire idle question

My daughters 2002 Pontiac Sunfire has an idle problem. With the A/C on, at a stop, in drive, after a few seconds, the idle speed surges to 1000 rpm, then drops back to normal. after a few seconds, the cycle repeats, until she drives off. our mechanic has no idea what’s causing this or how to repair it. Anyone have an answer?

thanks, Tim

The problem might be with the Idle Air Control valve. These can fail where they hunt for the proper idle speed for the different loads imposed on the engine while idling.


thanks for the reply. do you know where this is located and is it something I can replace myself? thanks, Tim