Strange problem with my 77, I take it out and drive it until it gets to operating temp, then I shut it off and try starting it back up a couple of minutes later and it just cranks. It has also done this once while I was driving, came to a stop light and it just quit. It does have spark, fuel pump is working and injectors seem to be cycling, fuel pressure is within specs and I've replaced the pressure regulator, filter and most of the lines. The weird thing is that when it won't start like this if I take the fuel supply line and disconnect it from the rail and just crank it with fuel going onto the ground it will start and run until the fuel in the rail is gone, hook the hose back up and it will run fine. Any help or suggestion or appreciated, thanks in advance.