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You could be getting a little cylinder "wash down" from an injector that's sticking open. Try a little fuel injector cleaner in the next tank of fuel.

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Q: 350 Chevrolet smokes bad at idle but not when revved up?
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Timing degrees on 1981 Chevrolet 350?

12 degrees on idle.


What would cause a Chevrolet 350 to not idle it will start and run under throttle but will not idle at all?

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