I reworked a 2015 2500 sierra 6.0 6l90e truck harness for a swap in a c10 pick up truck. I had reflashed the E78 pcm and turned off patch vat 1 and 2. go and start it and im not getting spark or injector pluse. I have gone over the harness and sensor all is good motor only has 5300kms on it brand new. am I missing something else in the pcm tune to disable vats cause that what it seems like but I only see vat 1 and 2. some help would be great thanks guys.