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I Have An 02 Yukon W/ The 5.3l. I Purchased A Superchip Programmer, Registered It Online, And Tried To Prog. Programmer Said Not Stk Program. Took To A Shop I Work With Who Can Reflash Gm's. He Said It Has The Stk Prog That Should Be In It. He Erased And Reprogrammed Anyway And Still The Same...