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Yep, this is exactly how my motor went
Gm isn't admitting it but there is a major issue with the afm. My car sounded exactly like yours does and the whole motor was toast. Just do yourself a favor after the put your new motor in. Check over ever inch of your motor. I found all kinds of loose things and bolts missing. Oh and check your oil level. Apparently that's an option with a new motor lol. My dipstick was completely dry. Cars being towed back in for possible damage to my new motor. I'm in the process now of getting a lawyer.
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