340 Shutsoff when Hot.....

Looking for ideas, our 340 seems to idle fine then, when gets some heat in it and let off the throttle it will kill over and not restart. Ex Pops ( Chris3 )took it out sunday to do some shakedown on it, runs good around the pits, then he staged it up run it through the gears and soon as he let off in high gear it cuts off and won't restart for about 15 min. Looking for any idea's distributor?? Msd box ?? I thank you guys as alwayd for your input.

Chris

Try another msd box. I was one round away from the money when I got on the transbrake the motor died and wouldn't restart for 10 min put in new box good ever since.