Hemi Continues to quit at Speed.

Couple of questions.

Does it quit and stay dead for a few minutes or does it restart and run fine immediately?

From what I understand regarding the Hot-Wire harness, it only requires 4 wires to hook up. I'd assume at least one of them is a ground. Where is it grounded? How close is it to the battery? How well is the engine grounded? How well is the ECU grounded? (Does it even require grounding?)

If you have to sit by the side of the road for while, that would suggest to me that you've got one or more questionable grounds that slowly builds up resistance as the under-hood temperature rises.

If it resets almost immediately, that would suggest to me that it is a computer glitch.

As others have said check for thrown error codes.

Electrical gremlins can be a pain to diagnose.

If you know someone with an oscilloscope you can check the output of various sensors like the crank and cam sensor to see how clean the signal is, perhaps when the motor heats up it introduces just enough resistance to dirty up the signal.

Hope this helps.

No one wants a car they can't drive.

Regards,

Joe Dokes