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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