PULL THE CARB OFF AND CLEAN AND CHECK IT AGAIN. YOU DIDN'T GET ALL THE CRUD OUT. ALSO MAKE SURE THE SEAL BETWEEN THE CARB AND THE CASE IS TIGHT. IF YOU TALK TO SOME OF YOU FELLOW FLYERS THERE IS SURE TO BE SOMEONE THAT KNOWS ABOUT THIS AND WILL HELP IF YOU NEED IT. THAT WILL BE A LOT BETTER THEN SENDING IT BACK AND WAITING.