Need help

[carr7883]

So December of 2021 I bought my 2016 Peterbilt 389 with an ISX. It was already de mandated to bare bones. I was excited at first thinking I wouldn’t have to deal with de mandated problems and have a nice powerful long lasting motor. From jump street I had to find a tune because the ECM was looking for VGT turbo and they removed that and put a {puke brand} turbo on here with their manifold. My engine would build boost to 35psi and almost immediately fall to 10-15psi. I got {another horrible big-name tuning company out of canada} to tune my ECM and from what I’ve read here that was probably a bad idea. I live in Charlotte and was wondering if anyone knows a place I can go and at least have my ECM looked at. Haven’t had any issues with truck until yesterday I had a shop change my governor from automatic to variable speed and now my throttle is acting weird. I can barely press it and the truck wants to haul ass and then fades as more peddle is pressed. I did gain 1.3 mpg as of today from 6.2-7.5. But truck doesn’t seem to want to go past 1600rpm at all and if it does it just turning the engine fast with 30lbs of boost and the power seems to stop. Anyway I know I have a garbage de mandate and a garbage tune. I’m new so please go easy on me. If anyone is willing to help I’d be greatly appreciative. Thanks again for allowing me to join this group.