Andrew Cline

Ok question... I have a 94 cavalier with the 2.2 and its doing something odd before i rigged it to never get hot it would die out and not start when it got to temp now it only starts dieing out at anything below 3/4 tank of gas and backfires through intake and exhaust if i rev it in neutral or park so far my compression ranges from 150 to 175 it has a new fuel pump and filter, new timing set, new icm, new egr solenoid, new plugs and wires. But sense i rigged the fans on at key on and gutted the thermostat when it dies i can just crank it right back on and go and is throwing a few codes but i cant fully make sense of them all...27, 28, 44, 55, 66