Symptoms indicates the idling speed is working correctly. For your year model, the engine should be K20Z1 and the idling speed specification is 750 - 850rpm, which indicates it is within specs. Sorry for missing this out.
No idle adjustment screws are provided. There is a stopper for the throttle plate which is factory set and should not be tampered with.
The after market air intake system would not afffect the idling speed. Check for vacuum leakages, especially the PCV which could be failing and allowing more than required air to get to the throttle body.
Thursday, December 2nd, 2010 AT 12:18 PM