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when you pull the plug wire off, you are releiving the cylinder of combustion pressure. This diagnosis is usually a piston slap NEW ANSWER; When you remove the wire it does take the load off of that cylinder.

You will find a rod bearing that is bad garented it.

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15y ago
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Q: What are the different possibilities of the source of a knock that stops when you pull the spark wire in a 5.7 Chevy?
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