Resistances may not be your issue but commands may be from the pcm. The iac usually retracks when the motor is turned off and returns to its last position when the motor re starts. If it sticks, it would cause the vibrating or an in consistent signal. There is no cleaning or servicing just replacement.
Make sure you dont have any vacuum leaks or anything else causing low idle like a dirty throttle body.
Tuesday, September 13th, 2011 AT 11:29 PM