Rattling sound during acceleration. Wtf?

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CapitalMark

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02 yukon with 317k 5.3L. I was in probably 2nd gear and a stepped on the gas to accelerate. Well, transmission didn't downshift and it let out a rattle that sounded eerily similar to rod knock. I let of the gas briefly then stepped on it again, and she down shifted and there wasn't any rattle. I am throwing a P0141 Code (02 Heater Circuit bank 1 senson 2, but not sure if that has anything to do with it. Should I be worried? Thanks in advance for any help.
 

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