R Pope and Don are right on about cleaning and maybe rebuilding your carb. I had a 3 carb set up that I bought on E-bay with the guy stating that it was just taken off his engine. Looked great when I got it and put it on andtried to start it and it ran like sh--. My mistake as I found out later that the car he took it off had be sitting for 7 months. Evaporating gas sure leaves a gummy residue