Hello. I?m new to the group and to tuning also. I had a truck donated to use do to medical reasons. Before I got the truck someone put a jasper non afm engine in. Truck was running really bad. I thought it was I. The tune so I bought a hp tuner I also have 2 credits. I scanned the truck it is a 07-1/2 gmc sierra 4x4 5.3. The afm was already disabled. So I think the cats are bad. Is there anyone that could help me with turning the emission stuff off and a street tune for a stock Eng. and turn 4x4 off as well. Thank you very much for reading.


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