FRUSTRATED! 2001 Miata Dies while driving or Won't Start

I have a 2001 Miata that was driven from Florida to Pennsylvania without problems. While driving along one day in PA the car just stalled like it lost spark. I could not get it to restart. I towed it to a mechanic and was called the next day and told it started right up. I had no problems with starting it many days and then one day I could not start it again. It cranks BUT WILL NOT START. Please Help.

Just did one. CAS was bad looks like half of a distributor. This one was very intermittant. Had to use lap scope to find problem. Mine was a 1990.