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Old 01-27-2004, 04:29 PM
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New engine misses at idle only

I have a 92 Chevy pu with 220k miles. Just put a new (Jasper) 350 ci motor in about 10k ago. Engine runs great but has a intermittent miss at idle only. I have replaced plugs and wires twice. Replaced coil and idle air control. Engine still misses at idle but runs fine at all other speeds and loads. Truck has TBI and my next guess is injectors which are original. Does anyone have any ideas before I continue replacing good parts? Thanks.

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Old 01-27-2004, 06:25 PM
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Could this be a vacuum leak?
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Old 01-27-2004, 06:39 PM
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New motor and the same 220k injectors, i would replace them. shine a timing light on them i bet one is barely spraying at idle.
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Old 01-28-2004, 09:00 PM
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Before you spend big bucks, try a $3 can of Berryman's Injector Cleaner in a half-tank of gas. Vacuum leak is a good possibility too.
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Old 01-28-2004, 09:52 PM
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yup vacume leak sounds like a strong possiblity
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