I bought a MPVI2 tuner and I have been familiarizing myself with the software with files from the tune repository. I?m afraid to jump in on mine unless I have a spare ECM to fall back on as this is my daily driver. My plan is to buy a spare ECM of the same year and service tag # and write my stock tune to it and use it for tuning. If anything goes wrong put the stock ECM back in I assume I can backup my stock tune without credits and then I would need credits to write to the spare ecm.
Is there anything I might be missing or is my logic flawed in any way? Do I have to relearn the keys or anything else when going from one to the other? Also, is the mileage transferred with the ECM? Does the vin transfer with the tune file? Any advice keeping me from making a costly mistake would be greatly appreciated. I hope to become a contributing member to this forum in the future.
2012 Chevy Silverado 1500 4x4 4.8L 4L60E 3.42