Recently purchased a 93 spider with 13K. She runs great but after driving for for approx. 10 to 15 min. it cuts out suddenly and completely and will not restart until it has sat for about an hour. I have only been able to duplicate this once in the garage. The car had no spark at the plugs until it sat for the usual amount of time. I have replaced the coil, but the problem continues. I hope someone can offer some suggestions. Of course this always seems to happen at when there is a lot of people around.