sounds like piston clatter, or piston slap. the cylinders are woredown enough that there is enough room in the bore for the piston to cock sideways in the cylinder, if it keeps at it, he will eventually bust the piston and send the small end of the rod threw the block.
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'96 Nissan Pathfinder
'02 Firebird Trans Am.
'88 K5 Blazer
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