L28 engine troubles

[FROZN]

Here's my story. I have a 73 240Z with a 5-speed 76 L28 FI motor. I went overseas for a few years leaving the car in storage. I totally rebuilt the motor when I got back, and now I seem to be having the wierdest problems. Two are the real biggies to me.

1) When I rev the engine in nuetral I can hit 7K with ease. When driving the engine chokes at 4K (simalar to when there's a hole in one of the airflow meter boots. A preveous problem)and will not excelerate unless I get off the gas and press down again. This gets progressively worse until I can no longer drive the car. I have a 76 factory service manual, my timing is correct, new spark plugs, XR-3000 ignition, PS-91 coil, ect. I'm hoping this is symptomatic of one of the EFI components going out. Can someone help me guess which one?

2) This one should be a little simpler. It has to do with the charging system. I can start my car, drive it to one location(if problem 1 lets me) and turn the car off. The car must then sit for an hour or so before I can start it again. I've tested the battery, alternator, and changed the voltage regulator.

Please forgive my spelling, the North Dakota cold slows my brain.

If I can't get it fixed my next move is to find anouther car and drop my motor in. (Rebuilds are kinda pricey, gotta get my moneys worth):classic:

[2ManyZs]

First question could be a simple one or a really tough one to fix.

First thing I would do is to check yoru fuel system, starting at the pump with a fuel pressure check, then check your fuel filter. It could be something as simple as a dirty filter or a bad pump.

If not then you'll need to give us some more info for us to come up with some ideas.

When it does it again, cut the car off and check the color of the plugs. It would be nice to know whether the problem is fuel related or ignition related. With the FI it's going to be a bit harder to figure this one out. Ahfter a fuel pressure check you might be able to start checking possible problems off the list of things to check.

Second problem, have you had your starter checked? Does it try to turn over or is it completely dead? Might it be the ignition switch? Or possibly a fuel pump relay that is getting hot and then causing the problem that might even be related to the first question?

As you can see it is not going to be an easy dilemma to solve, but with all of us putting our heads together we might be able to help.......