I need help troubleshooting my 2.2l ecotek engine. It was running okay when I parked it a few days ago but won't stay running after sitting for 3 days. It starts up okay but sputters out a few seconds after.

I have changed fuel filter and checked fuel pressure. Pressure maintains above 50-65 psi right up until it dies. Took the fuel rail off and checked the injectors while cranking, they are all putting out a good stream of fuel.

Did a smoke test looking for vacuum leaks, nothing.

I am assuming it has spark because it starts and runs smooth for a few seconds before it sputters and dies.

Any suggestions/questions?