i just did a ls swap in a 78 malibu i can read the pcm and scan it but cant write to it, it fails and gives me "mode 1 erased failed check 1 failed"? my battery voltage is at 12.8 at the pin in the fuse box that feeds the pcm. i can literally see all the wiring, can anyone maybe say what needs to go where so that i know i dont have a wiring problem i reused most of a stock harness off a 2001 5.3 and fuse box