I have a 91 Civic Hatch, It has stalled out on me and was told it was a bad fuel pump, went and changed fuel pump (installed new pump), fuel filter, main relay (new from Honda), still has same problem, would not stay running after a certain amount of time running. I was told to look into checking igniter and possible ignition coil. I had a spare igniter and coil and replaced it, also replaced O2 sensor and air sensor in manifold. A friend had a spare ECU and replaced it as well just for kicks and giggles, still have the same problem. If the car runs at idle it will run okay as soon as I put into gear to move it it will stall out down the road and not crank up. If it sits still for a while it will start up like nothing happen. Can't figure out what else to do or what else to replace. Can someone tell me what the problem may be?

Specs on car:
91 Civic Hatch
91 Acura Integra LS motor
Headers/Intake/Exhaust
Underdrive Pulley
Factory AC