I once had a 48 ford coupe when I was a kid, wish I still had it , oh well, anyways.I could drive it for a while, then it would quit. Like it was out of gas. Come to find out it had a bad coil. After it got hot, the coil, it would breakdown. I'd pull off the road and let it set a while then I was good to go until it got hot again. Changed the coil and no other problem. Just throwin it out there, Ernie