To start, I have a 75 280z cali model. I've recently rebuilt the engine and now currently trying to get it to run properly. I've got fuel/air, spark, and compression. The engine will start and run for a couple of mins then die. It gives up, doesint instantly die. When I go to start it again it just cranks. I've got the problem down to fuel. Because I can go and remove the injector relay, crank and it'll start and run with what's ever in the cylinders then die. I can then reconnect the relay and it'll start up. I can no longer think of what else it can be so I come to you.
A little info on the car
Fuel: 40psi via a gauge right after fuel filter. New lines, fpr, and new o rings on all injectors.
Air: new afm, throttle body, air pressure regulator. Egr delete
Spark: new wires, spark plugs, distributor, and coil.
Tests I've done: comprehension is above 120 on all cylinders. All injectors fire. Timeimg set to 10 btdc.