Car cranks, will eventually fire up but there is zero consistency in it firing up. When it does run, I can keep it throttled to 2500-3k rpm, and then eventually it’s just dies all together.

ECU pins 101/106 to any ground point with key off have zero resistance. When the key is turned on, the same pins test at 50 ohms to ground. This car had a MPI relay short internally and ever since then it’s had weird issues starting. I swapped the engine harness with a mint 90 harness, thinking this could be an issue, and it seems the problem has only continued to get worse. I have a log of the car running, but I doubt it’s of any use. Simply what I’m wondering if these resistance values on pin 101 and 106 with the key on are Normal.

My multimeter won’t even register continuity between pin 101/106 and any other grounding location on the car with the key on. Key off there is zero resistance. I have added grounds and replaced my battery/alternator with new terminals as well recently. I’ve swapped every spare sensor/component that would possible cause the car to not run, I’ve verified timing, and this has convinced me that this is something wiring related.