1996 GMC Sierra IDLE PROBLEMS

1996 GMC SIERRA
150,000 MILES • V8 • 4WD • AUTOMATIC
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DANDCCONNELL
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  • 1 POST
MY ENGINE CONSTANTLY IDLES BACK AND FORTH HIGH AND LOW. WHEN I START IT, IT STARTS UP HIGH FOR ABOUT 30 SECONDS BEFORE DROPPING DOWN WHERE IT SHOULD BE. IT RUNS FINE WHEN I'M MOVING BUT WHEN I'M AT A STANDSTILL IT IDLES UP AND DOWN WHILE SITTING THERE.
Mar 1, 2008 at 5:29 PM
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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