What intake do you have?

I would 1st see if the car is dying from fuel or electrical.
When it dies, see if the carb pump squirter still squirts gas.
(and does it start right back upafter it dies)
I would not think the alternator would shut the car down and still have enough to start up again.
I'll look at my wiring diagrams. The coil may be the problem though it might be getting too hot?

Hello, I wish I could help you but I have no experience with bondo/primer on the endure bumper. Good luck!