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What is wrong if 1988 350 Chevy idles too fast when motor warms up?
Wiki User
∙ 12y ago
You've probably got a vacuum leak under your throttle body. I have an 88 c1500 with the 4.3 and it idled at over 1000 rpm all the time. Found out that it was a bad gasket between the t.b. and the intake manifold. It took about 20 minutes to replace and it idled beautifully afterward. Grab a can of carb cleaner too, it prolly wouldn't hurt.
It could also be the IDLE AIR CONTROL VALVE, easy to change, cost about 45 bucks at your local auto parts store.
Wiki User
∙ 12y ago
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