I'm new to the forum also but I may have some insight here. Years ago my Datsun 260Z was having a similar problem. It would be running fine and then it would die unexpectedly. After about 5-10 minutes it would start up and run fine again until next time. It drove me crazy. Turned out it was the fuel filter. I had gotten a dirty load of fuel and the dirt had gotten sucked up against the cartridge filter and starved the fuel to the engine. After the few minute wait the dirt dropped off the filter and the flow was unrestricted again. Started right up. Hope this helps.