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I have a 1990 cavalier z24 when you first start the car the rpms are around 1000 rpm then when you drive for a while when you idle at the light it runs around 500rpm and the motor runs ruff?
Wiki User
∙ 17y ago
My son has an 1989 z24 that was doing the same thing. After changing all the sensors and plugs, plugwires,fuel filter,coils,throttle position sensor i deceided to attempt to change the fuel pressure regulator while releiveing the pressure off the fuel rail i noticed fuel had been leaking around the valve so i took a valve core stem out of an old tire and replaced it started the car up and it seems to be fine now. Try it.
Wiki User
∙ 17y ago
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