[john walker's workshop]

Originally Posted by stlrj

You might check the idle throttle switch first, then have the base idle speed and mixture set to spec.

agreed. too high an idle speed or a throttle micro-switch not closing can cause this. try turning down the idle first. 800-880. that's the center adjustment screw on the throttle housing, lookin right at you. 7mm deep socket, clockwise. break off the yellow plastic cap if it's still there.