Fuel Injection Help Please, 74 1.8 LJet Options

[SteveL]

OK - this all started a while back with the engine dying after running for a while and getting warm. Extensive troubleshooting followed.
Here is Where I am at:
New SMP Injectors and injector seals.
Connected HF fuel pressure gauge. Fuel pressure is good.
After installing new injectors, it ran good, until I broke one of the fuel injector connector wires while buttoning things back up.
Checked out the harness, and it is pretty questionable, even if I made the repair I could see. So, bought a rebuilt harness from Bowlsby.
Installed FI harness, and while I was in there, I replaced all vacuum lines, including the manifold connector hoses, and intake manifold gaskets.
All back together, now it cranks and gives 3 outcomes:
1: No start at all
2: Fires, runs for a cycle or two, then dies
3: Fires, revs up to about 3k, then dies (throttle action makes no difference)
I have rechecked all harness connections, they are solid. Rechecked vacuum lines, they LOOK correct, but we all know that if it looked right the first time, it will still look right the second time.

Help!!!! I am in MN and only have a few more weeks before the dreaded white crap falls from the sky and ends the season.

[Geezer914]

How about the harness from the relay board to the dual relay? Did you check continuity? That connects to the resistor block on the dual relay. Did you do a smoke test? I replaced the injectors with new seals and #4 was leaking. Had to use some Hylomar on the seal and it runs fine. Only found the leak with a smoke test. Don't take vacuum leaks for granted. The 1.8L will not run with vacuum leaks, ask me how I know. I was chasing the same problem for months.