1991 GMC Sonoma high idle

1991 GMC SONOMA
140,000 MILES • 4 CYL • 2WD • MANUAL
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CADILLACSHANE
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  • 1 POST
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
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Has the check engine light ever come on? Have you checked for vacuum leaks?

Let me know.
Nov 17, 2009 at 5:43 PM
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