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Jr. Doran Posted on Dec 20, 2014
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1988 chevy 3500 454 7.4 runs good for a min then misses at idle and is undriveable as underload it cuts out and back ires through tbi

Have replaced distributor, map, etc, coil, fuel pump and filter

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Joseph Howard

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  • Chevrolet Master 753 Answers
  • Posted on Dec 27, 2014
Joseph Howard
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Have you replaced distributor or just the cap?

Jay Plesset

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  • Chevrolet Master 2,942 Answers
  • Posted on Dec 21, 2014
Jay Plesset
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Checked timing? Ignition wires all good? Misfire under load may indicate bad wires.

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Whatever FI emulates a choke...

I'm assuming you have fuel injection....
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Also try looking up your TSB (tech service bulletins) on
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