'90 lumina won't stay running

1990 chevy lumina 2.5 TBI engine - the engine runs approx. 3-4 seconds and everything sounds fine. Then it stalls. If you put gas down the throttlebore, it will run until you stop pouring gas down it. it has a new computer, and the disc module has been checked. The injector is at 1.5 ohmage (as specified) and the fuel pressure at the fuel filter is 30 pounds. I have had it run beyond the 3-4 seconds and when the scan tool was attached it went from full rich to full lean. any ideas on what's wrong?

1990 chevy lumina 2.5 TBI engine - the engine runs approx. 3-4 seconds and everything sounds fine. Then it stalls. If you put gas down the throttlebore, it will run until you stop pouring gas down it. it has a new computer, and the disc module has been checked. The injector is at 1.5 ohmage (as specified) and the fuel pressure at the fuel filter is 30 pounds. I have had it run beyond the 3-4 seconds and when the scan tool was attached it went from full rich to full lean. any ideas on what's wrong?

Have you looked to see if when it is running, and starts to stall out,if the fuel spray from the injector stops? I know this wouldnt narrow it down to much, but least you would know that it is either fuel stoppage, or the injector circuts/wiring possible fault

Have you looked to see if when it is running, and starts to stall out,if the fuel spray from the injector stops? I know this wouldnt narrow it down to much, but least you would know that it is either fuel stoppage, or the injector circuts/wiring possible fault

we did look - there is no gas spray when it stalls out.