I have a 90 blazer with a 4.3 tbi, it has 199xxx miles just bought it, ive replaced wires plugs, rebuilt tbi, did oil change because i found ALOT of gas in my oil . it starts up and runs for a second, backfires and stalls. i had it running and idling but as soon as i put it in gear it stalls. also wen i put it in gear my check engine light comes on. If i unhook both of the injectors it runs ook for a few min but if i hook one up it will die. anybody got any ideas to help me?!?!?!

 

Check over your wiring to make sure that nothing is grounding out. Remove and clean the EGR valve. Check what the CEL is trying to tell you by pulling the codes.