I have a hard time getting the idle down low enough every time I try to shift out of neutral into either reverse or forward. The motor will cut out. I am wondering if it has to do with buildup where the gas enters the combustion chamber. When I cut it down too much it can't maintain enough gas to keep the motor running (or so it seems). Can you safely add gas treatment carburetor cleaner to the fuel tank and run the outboard on it to try and clean it out a bit? If so, how much is safe and is there any suggested brand? All the automotive ones I find say to add the entire bottle ( which I know wouldn't be good in a 6 gallon tank).