Idle problem.Thought fuel, but it was bad ECU

Yes, the reluctor has crossed my feeble mind. Think a new one is in order? I wonder if a new one is made over seas now? Quality?
I had a 340 Challenger with an MSD box. I'm trying to remember the details of the problem. Can't recall exactly. Years ago. Think it worked till the box got hot.
But I do remember part of the trouble shooting. The system would run on an orange box. But the MSD would not run on the same "brand new" system on that one.
Plug one in, no work. Plug the orange in, worked.

Thanks for the pin suggestion. Gotta get the fluke out.
Since simply plugging in a new box made all the differance on this car I'm hopeful.........