I have a 1976 El Camino. This car has had some significant time sitting in a driveway undriven in the past. I just had the engine rebuilt and it runs great, however without warning it just konks out and I'm left stranded. I'm unable to start it unless I wait 30 minutes or more and then it cranks right up and drives great. As I research I am wondering if this is due to floaters sticking or if there is something got else that could be causing this.

I love the car but am afraid to drive it and be stranded someplace.