This is my first post, first swap, first attempt at tuning. I have a 2001 5.3 LM7 with a 02 Z06 cam, 799 heads, L33 rotating assembly, stock truck intake and throttle body with 25317628 injectors, Walbro 255, modified factory harness swapped into a 79 cutlass.
The car will start and runs great until it gets warm, then it starts missing badly throwing a P0300 code. Any ideas of what this could be? I have the current HPT as well as the HPL file attached.