K, I know there's some Chevy experts on here and I'm getting very burnt out on working on mine. So, rebuilt the top end a few months ago, trucks been running great since. Changed out the Coolant temp sens, thermostat, and coolant, the other day, and all of a sudden, it runs like shit. Idles fine, nice and smooth. Temp is normal. Truck just sputters like mad once you start giving it gas. Backfires and misses like crazy, rpms shoot all over the place too. Feels like a fuel issue but Im not sure. Not saying the problem is related to me changing the coolant, im sure its not. All fuses are good, possible fuel relay issue?
Ideas? Suggestions? Any sort of sensor to double check? Truck is a 1995 GMC K1500 w/ a 5.7L 117k miles. Thanks.