If it was running before the head swap go back and check every connector and sensor you removed or disturbed. Also check the sensors and connectors around the area you worked. It will be something you touched, start simple. Don't overthink it.

SOLD!!: 91 LS 95 SR Rear LSD front 95 LS front brakes Dons Bumper 10k Gorilla/Promark winch Safari Snorkel Dual bouncy 31's

1991 Chevy Suburban 33's. All other stock.