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on tbi systems, usually a vaccuum leak. check gaskets on the carb, and hoses that are carb related
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What causes high idle and then rough high idle when heater is turned on?
Vacuum leek
What causes a truck to idle high when started?
the choke is on
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Separation of the ethanol due to water in the gasoline.
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did you find a solution yet
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The cause of high engine idle and surges in the 1989 Corvette is due to..Read More
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I have 91 chevy k1500, It does this, Sometimes it will idle a few minutes, then jump to high idle and check engine light comes on, And sometimes its as soon as i start the engine... I was told it was a vacum leak, But im no mechanic
Engine problems 1990 Toyota Celica look at the discussion?
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Could be several reasons but a vacuum leak would be most likely.
Why does my Pontiac 6000 have a high idle?
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Could be a vacuum leak
