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Chances are you have a bad wire or plug causing it ; It is easy for a weak plug or wire to hit without a load ,so if it is time for a tune-up I would replace the wire set and plugs. Check your cap and rotor also. I hope this helps you. Mark Mark thanks for the help. New wires did the trick. Truck runs great. Thanks again!!!!

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โˆ™ 2005-12-06 06:13:06
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Q: 1988 K2500 Chevy 4x4 5.7 misses under a load while driving but not while revving the engine?
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