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this sounds like the big end bearings in engine are worn.this is an expensive repair,depending on how long the knocking has been knocking and whether the crankshaft has been damaged enought to need a new crankshaft.

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Q: My 1987 Chevrolet caprice has a loud knocking noise and when there is more pressure on gas pedal it gets louder. What could be causing there and approx how much to repair?
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