Ok, here goes.

I have a deleted 2007.5 6.7L that just cost me a pretty penny for an ECU; however, after I got it replaced, the shop recommended that I return the tuner because my old one was acting strange and may have contributed to the frying of the computer.

MY EXHAUST BRAKE ISN'T WORKING WELL after I got it replaced and brought her back.

I went the wrong route of parts cannon and assumed I had a lousy actuator.

I replaced it myself and didn't change anything; the shop is refusing to look into it without it being a whole new ticket and possibly costing many more $$$.

I already tried returning the truck to stock and test driving it, and it didn't affect anything, so I reinstalled the tune and came here with my head hung low any advice is appreciated.