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Engine noise 2000 Tahoe 5.3
My neighbors Tahoe has been parked for a couple of weeks and he went to start it this morning and it's knocking. Are there any engine issues with the 5.3 from that year? Like spun or seized main bearings? I've seen a TSB for lifter noise but this is beyond that. He said when they parked it there were no abnormal noises.
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