318 won't stay running

Yeah, the easy stuff. From what I recall, the OP says it starts and runs for a while, then dies. Would a ballast do that? My experience with ballasts is that #1 you carry a spare in the glove box, # 2 when they go, they go, they burn out causing an open in the circuit. The car will start, when you release they key to run, it stalls. Reading post # 1 this is a possibility.