Eric, On ym car it idles perfectly until my car gets really warmed after a good drive. The my idle seems to be elevated a bit (400rpm), and maintains that right on. I have cleaned everything, replaced alot, and this was my last idea. Let me give it try and see if it works. Thank you. - Shain #10140 ----- In Response To ----- > Hi Shain, > The thermistor in the Idle Speed circuit activates a circuit in the > Idle Speed ECU, when the coolant is below 15 degrees C, which tells > the ECU to open the idle speed regulator a little more - to allow the > engine to idle faster when it is cold, or warming up. [moderator snip]