Problem should be with the idle control system and it could be the IAC is sticking. Ensure the coolant level is correct and the coolant hoses to the IAC are not clogged. The link below should be helpful. Clean the throttle body as well.
Redjust the idling speed after cleaning. the idle adjust screw shoud be removed for cleaning as well. Before removal, turn in the screw fully until it contacts and note how much it is turned. After cleaning fully turn in the screw and back off the amount it previously was set prior to sdjustment if necessary.
Check for vacuum leakages if problem is not resolved.
Images (Click to enlarge)
Sunday, December 9th, 2012 AT 9:06 AM