Troubleshooting: 2.0 won't stay running Options

[Nate]

Hey everyone! Hope you are all preparing for a nice thanksgiving.

Wanted to see what ideas you guys had about my original FI 2.0 from 73. Some of you may have seen a few other threads of mine but I'll give a little synopsis. I rebuild the motor in my garage. New Pistons and cylinders, all new bearings, lifters. Ground crank and cam. Heads rebuilt by a reputable shop. For the rest of the car. New fuel lines, cleaned and coated fuel tank. New fuel filter. Cleaned and flow matched fuel injectors. Rebuilt distributor. Tuned dwell angle and set static timing.

So I've done all of that and the car won't stay running. It'll start and run for 20 seconds with a high idle (approximately 2500 rpm's) and then it will die even if I'm feathering the throttle.

I'm looking for ideas as to what and how to troubleshoot the car. IF this car was a person I'd strangle it to relieve my frustration.

P.S. I went through the ecu harness and ohm'd everything out and there are no shorts in the wiring and the grounds are solid. I also replaced the throttle position switch and have that set up according to the book and have messed with the idle mixture knob a bit.
Anyone have any ideas on where I should go from here?

Thanks and I wish everyone a good safe holiday.

[Nate]

A little more info to add to this dilema. I stepped away from it for a couple days to clear my head haha. Went back at it today for a bit. Tested spark at all plugs. All strong blue sparks. Tested fuel through the injectors into jars and was getting fuel. Funny thing I did notice today, engine seemed to run better while cylnders 1 and 2 were not firing. It would actually idle for a few seconds. Albeit it was a rough idle. I don't know if this means anything.

Summary of what we know:
Getting spark
Getting fuel through injectors
CHT sensor set up with a variable resistance pot and set to 1400 ohms for "cold" starting
MPS checked out with the ohm meter at 90 ohms and 350 ohms on the appropriate terminals and when I apply vacuum (read: suck on the port) it is holding the vacuum.