I have a 05 max and I am getting a fuel smell and some brownish liquid in the airbox and filter. smells like old gas, but doesn't have the flammability I would expect from gas. #1 carb seems like it is popping a little and I seem like I have performance issues and popping noises until about 3-4k rpm. I have completed the shotgun carb cleaning and run several additives in the fuel. Ideas please? :ummm: