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Username Post: 4. Erratic Idle, stall 1989 4.3 S-10
Senior Chevytalk Moderator
Posts: 24954
Loc: Austin, TX 78748
Reg: 05-09-00
04-22-19 07:36 AM - Post#2764813    
    In response to Mad Professor

High idle at start or up and down idle, can be a vac leak. Spray some WD40 along the TBI base. If idle changes, the gasket is toast. Check hoses for cracks. The sensor on the passenger side is known for bad vac lines.
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles

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