Make sure the electric plug to the vacuum advance solenoid by the distributor is plugged in. If it isn't the car will idle rough but run normally at speed. It's easy to knock it off when working around that part of the engine compartment. Bruce Benson > My car has developed a rough idle that has been most annoying. It sits > around 850 RPMs, and I know my idle speed motor is working. When it's at > this engine speed, it almost sounds like a distant helicopter. By that I'm > assuming it's not firing correctly on one cylinder at idle. It doesn't feel > like a completely dead cylinder, as when I'm driving it has all the power it > used to. I can rev it up and the engine sounds very smooth and quiet. > payne >