1991 GMC Sonoma high idle

1991 GMC SONOMA
140,000 MILES • 4 CYL • 2WD • MANUAL
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CADILLACSHANE
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it has a random high idle when clutch is depressed and or shifted into neutral and clutch released only does it occasionally and doesnt last but a few minutes i have already changed the idle control valve brend new spark plug and wires and have ran some seafoam gas cleaner through the fuel system just bought the truck about a month ago and cant figure out what it is please help
Nov 15, 2009 at 6:26 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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