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Update on this. The problem seems likely to be related.
Got a CEL. Onstar said "variable valve timing problem" when they read the code. Car bucks and surges at all RPMs during acceleration and constant speed driving. Almost feels like a big cam with a bad tune. Dropped it off at the dealer this morning. Will post the resolution when I find out.
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2019 GMC Sierra 1500 AT4
Summit White
6" Lift, 37x13.50R24's
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