I have a 81 e90tlcim v4, my problem is that the motor dies out at full throttle, can back it down to an idle motor stays running but it is kind of rough. I am pretty sure I have a carb problem, because when the motor is tilted up to the travel position the bottom carb empties out the front. I am thinking maybe a stuck float in the bottom carb. Am I on the right track? thanks in advance.