I have a 1976 carb Rabbit 4-door automatic and it starts fine, drives fine on flats, but when I go up any hills it will not let the secondary kick in and it slows up and acts like it wants to die or does die, depending on the incline. I am just wondering if that could just be a float, vacuum lines hooked up wrong, ???? I am frustrated and want to get this car fixed!!!! Any advice would help out a great deal!!!! Thanks in advance.