I have an '86 F150 with a 351W, Edelbrock Torker II intake and an OLD Holley 600 carb and a stock ignition system. I can go outside first thing in the morning, pump the gas once & she fires right up. The problem is once she warms up, if I shut her down for more than 10 mins. and come back, she has to turn over and over before she finally starts. Is this an old carb problem?