HELP!!!!!! I am in desperate need of some help, I have a 78' and for the past two weeks, every once in a while my car will just shut off while driving. after I let it sit for a while it will start back up. this has left me stranded a few times on the freeway. It doesn't seem to be electrical as far as I now I have tested all your major electrical and it all works. could this be vapor lock and if so how do I remedy the situation? Thank you in advance.