Mopar ecm issues. Why wont they work?

Maybe you have a distributor pickup on the ragged edge. Any chance you have a spare working distributor?

Make absolutely certain you have scraped the box mounting ear for electrical contact.

Also try this: with the box GROUNDED and the harness connected, turn the key to "run." Rig the coil wire with a test gap and separate the dist. connector. Repeatedly tap the bare end of the 2 wire connector from the engine harness onto a ground. Each time you do should produce one single hot "snap!" spark.

Check voltage at coil positive terminal with the key "in run." Voltage should be well below battery, AKA somewhere around 5-10V. If it's lower, you may have low voltage. If it's "same as battery" IE about 12V, the box is not conducting current through the coil. Move to the ballast. Check both ends. One end should be 12V "same as battery" and the other end should be same as what you just measured at the coil. If the battery end is low, check for harness drop. What you are trying to do with these last tests is to determin 1: if the box is conducting current through the coil and 2: If the system is getting adequate voltage through the key/ ballast

You might work the ECU connector in/ out numerous times, maybe some oxidation in there.