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'88 740 vibration at idle 700 1988

posted by  someone claiming to be fixit 2003 on  Wed Nov 23 02:55 CST 2005 [RELATED]

You mentioned that you cleaned the IAC but it's also a good idea to test it to see if it's operating properly. They can be clean but still not open all the way. Connect the pos battery terminal to the middle pin and ground the outer pins one at a time. It's a torguey little motor and the valve should flip back a forth quickly. Maybe remove the throttle body and also give it a good cleaning. How's your air filter ???






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