1987 Chevy Camaro Car won't stay running.

I have an 87 camaro 2.8 tpi that will start but wont stay running. I have checked and replaced the following. Its getting fire from coil to distributer to the plugs. It has full pressure for fuel on the rail at 45-47 PSI.

*THINGS REPLACED*
fuel pressure regulator.
fuel pump.
fuel pump harness.
solonoid.
battery Wires.
Fuel pump relay and fuse.
Gm Moduel (Ignition Module)