any one know why my 91 accord is idling crazy, it revs up to almost 3000 rpms and then drops and just keeps going up and down, the check engine light has not came on so im thinking it shouldnt be a sensor, any of you guys had the same problem????

 

welcome to the forum. check your idle air control valve.

 

vacuum's correct?

 

yea i put a TPS and IAC on it and was lettin it run and checkin for vacume leaks and noticed the intake gasket had gone out thanx for your help guys