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Hey guys. I'm at my uncles this weekend and he says he had a programmer that changes tire sizes. I have been wanting to do that for a bit so I said sure. I didn't even think it would try to tune my truck also. I have my comp box in the truck as well. I set the tire size and went for a drive. It felt like the the timing was all over the place!!!! I turned the comp off and it seemed to smoothen out but I have a serious power loss now. I tried to get back in with the other programmer to erase all its settings and now it won't recognize the truck. It says that it's not the original vehicle. This programmer is a smart chips "micro max" tuner. Obd II plug in. I have to drive 200 miles tonight!!! Any have an idea??? Thank you!!