I have a 1993 Pontiac Transport 3.8 6-Cylinder. I replaced the fuel filter which I am guessing I put bad gas in it because it was all dirty when I took the lines off and replaced it. Put new one on and it ran good. Two days later started cutting out and died. Ended up having to pour gas on the air filter each time it died until I could get home. Replaced the fuel pump, spark plugs, took off injectors and cleaned, and now it will turn over somewhat but then dies. Checked the injectors with a test light & multimeter. Reads 12V but not reading a pulse. Any suggestions? Running out of ideas.