1991 GMC Suburban erratic idle

1991 GMC SUBURBAN
209,000 MILES • V8 • 2WD • AUTOMATIC
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SHANIAC
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  • 1 POST
the idle goes up and down. when i unplug the map sensor it stops idling up and down. i replaced map sensor ,problem didnt change. dont know where to start.
Oct 10, 2009 at 2:40 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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