thanks Robert; the throttle spool seems to be fine. But when I start the car it still goes up to 3000 RPM. I assume there must be something in the idle control that isn't functioning properly. It worked fine before the tune-up. What would make the RPM;s jump to this speed and where do I start to look for a way to slow it down. I'm sure I'm not the only one who has had problems with idle speed, please help!