1992 Pontiac Grand Am stalling and won't start

My car was stalling intermittently, it never stalled at the same time, as in, sometimes the car would be hot and others it would stall after just driving 2 blocks, and still other times it didn't stall at all. I took it in for diagnostics and was told it was the ignition control module. I replaced that, and the coils, and the boots and spark plugs. Still the car wouldn't start. I then replaced the crankshaft sensor and had the throttle position sensor tested. I can hear the fuel pump turn on when I start the car but I am thinking that fuel pressure may be the issue. But I don't know how to test for that. I am at a loss at this point can someone please help. Thank you