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Bad gas or exessive timing. I have one of these, check for overheating (bad thermostat), check for proper fuel pressure--possibly clogged fuel filter or a kink in the fuel line. Or like mine I had a head gasket blow between two cylinders and it would only knock under load.

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Q: What would make an engine knock at times when stepping hard on the gas but not lose power on a 1992 Chevy Suburban?
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