Any experience with 380hp mpfi conversion kit?

OK I have made a few engine harnesses from ram trucks with obd2 ecm's and haven't had any problems. They start,run and shift as they should in older vehicles.

Now I also have 2 of the mopar performance p5153734ab ecm's for the 380hp crate engine mpfi conversion kit. But can't get them to run on the harnesses I made.

I must be missing something in the instruction sheet and wiring diagram sheet from mopar performance as they will fire the engine right up but then they die in a few seconds.

Anyone play with the 380hp crate mpfi kit before?

Thanks for any help this is driving me crazy