1994 Pontiac Grand Prix Engine Diagram

This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can next permit the engine to rev up taking into consideration not desired causing harsh running. As its a mechanical deformity it tends not to point upon the oddity fresh and you can sometimes listen a hissing noise when the engine running.

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I started the car stirring this morning, it starts happening and runs at 1750 and within a minute or correspondingly climbs beyond 2500.. It is meting out serene though, just habit well ahead than it should be. I as well as checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and every associates verified. I setting fine just about them as I've been in there a bunch of times..

in the same way as I start the car, the engine surges happening amongst 1200 and 2000 rpm urge on and forth. I misused the IAC and the TPS afterward no regulate in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle enthusiasm screw to degrade the rpm and it would keep for a while. Now, the engine is continuously surging to the dwindling where I cannot drive it for dread of damage to the drive train. Any experienced solution?

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