I had guy from so cal diesel build me a tune for my stock tranny 05 gmc sierra 2500 duramax with AFE air intake and 4" mbrp exhaust with 33 12.5 toyo mt. When I installed the tune into my truck it didnt work on my truck it acted like it went into limp mode it had zero power and torq it felt like the emergency brake was on. Guy and I did some trouble shooting with the dsp5 switch but it was working fine he gave me a single tune to see if it was his dsp5 tune but same thing no power or torq. Guy refunded my money so if any body could give me some advise I would appreciate it. My alarm took a crap could that affect the tune? I had guy tune my truck back in 2008 for a economy tow tune and that works fine!
I live in the Portland OR area so if any body could help