This just happened to me today... after an
engine install this spring. I still have mostly original wiring. My case, however... car fired right back up on the side of the road (without opening the hood, or touching a thing) after about 30 seconds, and didn’t happen again for the rest of the cruise.
I’ll be looking at all of these possibilities, and after reading this, I’ll know to check a handful of things before I even try to restart... if I can’t find the issue before going back on the road.
This also prompts me to finally put together my on-the-Road-kit.