make sure your tube is on between carbs and also make sure you didnt put slides in backwards... i know i know they only go in one way.. but if you get them in the wrong carb they will be in backwards... look at book for pict which way half moon goes on the slide and make sure slides on in right you may have got them crossed... also check the wires going to the lil block that has the plugs wires and make sure you got good connection there...