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Not really.. i changes alot. Plugs wires. Maf i git cheap like 60$ ac delco. Coil packs, and new throttke body and tpm sensor off amazon ac delco for 127 $$ sold allmold.parts on ebay so it wasnt too much of a loss.. put a flowmaster on it also.. and honesty it seemed to smooth out.. not...

Recently bought a 04 yukon xl denali 6.0. Had a code and replaced cat codese been out for weeks. But still a rough idle. More like a shinmy and littke shake. But therest seems fine. Except i jist realizes while parked at baseball practice, car was warm.my heat wasnt hot but when i drove it...