I have a 48' with a 54' 235. It starts great runs great, but when I drive for 2 miles it begins to act like its starving for fuel. What would cause that? It has a new fuel pump, new plugs and wires, new points and condenser. It has a Rochester car with a new kit. When I pull the top off the carb the bowl is full and the float neddle doesn't seem to be sticking. I'm stumped- any ideas?