I have a 91 blazer, i can not keep it running for the life of me. The only way it will stay running is if i stay on the gas so i thought fuel pump and filter. Pump it working when i turn the key and i replaced the filter. It ran for about 5 minutes, so i started to move it to see how it was well i got about 100 ft. and it just died. I am getting spark from all the plugs and fuel is traveling fine. I am dumb founded. its a 4.3 tbi engine. Anyone have any ideas?