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Re: This is a new one Please help
is it TBI or CPI?
First thought I had is the butterfly valve is sticking open.
Second thought is the fuel pressure regulator is stuck open.
Third thought was the idle air control valve is malfunctioning ( but I think this would throw a code and the check engine light would be on)
Certainly start with the basics, pop the air filter housing off the intake and make sure the throttle linkage is working correctly and the butterfly valve are closing correctly.
From what you've described, way too much fuel is being fed to the engine at idle.
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'89 Astro 4.3L Z
CFM-Tech power plate
2.5" exhaust, Low restriction cat and muffler
Jet stage I chip
B&M trans cooler
'96 Jeep Cherokee
'99 Chevy Cavalier
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