2001 Chevy Malibu 3.1L rod knock

Vehicle had intake manifold gasket replaced, throttle body and IAC cleaned. It then started stall while test driving, followed by starting to make this noise. The day after this video was made, I moved the car into my driveway and it stopped running for good, refusing to turn over. Once I opened it up, found one of the pistons had disintegrated and a chunk of it got wedged in the crank. I also found the head of a valve. My best guess right now is that a valve seat dropped into the cylinder and started to rattle around until it broke the valve, which then busted up the piston. The engine in the car has since been replaced and now runs like a champ.

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I have a Malibu with what sounds like the famous piston slap, however it doesnt go away. I replaced the lifters because I had to replace a leaking intake gasket anyway. It has new plugs and wires and has always made the sound even before replacing them. It sounds like it's coming from the top of the engine however I am open to any and all diagnostics. Please leave a comment. Thanks

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