91 z28 Rough Idle Please help
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Junior Member
Joined: Mar 2011
Posts: 17
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From: California
Car: 91 z28
Engine: 5.7 350 TPI '91
Transmission: World class T-5
Axle/Gears: Stock ??
91 z28 Rough Idle Please help
91 z28 350 TPI .. Has rough idle cold or warm. Constantly revs back and forth from 1100rpm-2000 RPM. Im not getting any check engine lights/codes which makes me not think THrottle position sensor or IAC valve ? Any ideas please help!
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Joined: May 2010
Posts: 259
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From: Boulder Colorado
Car: 1988 GTA
Engine: 5.7 TPI w/ Bosch III's
Transmission: T56
Axle/Gears: 3.27 Borg Warner 9 bolt
Re: 91 z28 Rough Idle Please help
Start with easy things to check...like a vacuum leak. If you have a voltmeter you could measure the top two wires of the Throttle Position Sensor...it should be .54V at idle.
Did your car ever run right or did you buy it like this?
Did your car ever run right or did you buy it like this?
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