2011 Camaro L99 Limp Mode after Dynotune

[5thGenWI]

Hello, about a month ago I acquired a 2011 Camaro SS through Copart after some research (pervious owner's Instagram) I found out the car was Cammed and running E85


After getting the vehicle home I had to install a new drive belt and ordered a reman ECM (original was missing) Dealer put factory tune on it and I ran it out of E-85 and put 91 back in and had it tuned


To my knowledge car had a BTR Stage 2 with Longtubes and is making 385hp to the wheel (dyno said his machine runs ~10% lower on paper then person).

When I went to pick it up it almost instantly went into limp mode with P0010, P0036, P0056, P0315, P2135 and ended up trailering back to an auto repair shop. After having it sit for a couple of weeks we cleared the codes they were instantly back on but it ran good for about 8 minutes then went into limp mode again (while driving around). The Tuner usually does MOPAR vehicles and said it wasn't doing that during the runs and I want to have some more info before I start throwing around more money on it, thank you.