Camaro 3.4 with the Camaros DIS and injectors. running a 3.1 lumina harness and 7727 ecm.

ive got fuekl and fire, but its kicking back against the starter and backfiring through the exhaust or throttle body like its out of time.

engine is wired just like it would be in a lumina.

it ran when I pulled it in, just incredibly badly. poor throttle response, very difficult hot restart, poor fuel economy.

repair was to correct the severly hacked/melted harness from prior attempts at repairs by other mechanics, and where the harness was aginst the headers.

now, I cant get it to fire.

any ideas?