92 Toyota Camry stalling and wont restart

I have a 92 Toyota Camry that stalls after 20 minutes and will not restart. The next morning it will restart. Been testing it in the driveway and after 20 min it will stall out. I have replaced the fuel filter, cap, rotor and plugs. Engine runs fine and idles down while worming up. By chance last night I had my test meter on the test terminal FP and ground watching the power to the fuel pump. The engine stalled as if you turned the ignition off but the power to the fuel pump continued for a couple of seconds ruling out the EFI relay and the Circuit opening relay.I hit her with starting fluid to see if she had an ignition problem and she did sputter but would not start. I'm trying to rule out the fuel pump pressure because she shuts down so cleanly without as much as a sputter. Not sure if there is something else that could cause it that I may be overlooking.