i have a NR 3 port. it is running on a near perfect tune. runs great.... except it want to lose fire. it may go 5 laps and die and the next time it will only go a half lap. it usually dies on an impact like a jump or a crash. it will also die coming out of a corner. after i get out of the fuel and then i get back in. usually sounds like i just ran out of fuel on a perfect tune. ?????????? the engine has 1.5 gallons on it. has good pinch.????????

please help.