Adding Two Strok oil to your gas,,,,,
Lengthy discussion and I mention it only because this may help some of us with older cars whose ring packs have stuck and trying this did wonders to my old Acura Integra. My son now owns the car and it has 225k on it, never been opened or apart, trying this technique really helped the idle smooth out and added some lost power.
Read on:
http://www.ls1.com/forums/showthread.php?t=91206