79' 318 ecu is live

Take it easy there Andy! The Box WAS MOUNTED and still same issue. I ALSO grounded it when off the firewall to probe, (not run) Fake or not? I don't know, but believe it to be original to the motor. So easy with the I don't read crap please. Some grasp things a little differently than others.
No YOU listen. You were doing off base stupidly thought out so called "testing" that was leading you down the dark primrose path.

You were already informed of this fact earlier in the thread and yet you stayed with it.

THE BOX MUST BE GROUNDED. Period

Good luck, I am done with your ***