I have a 2001, 115 Evinrude Ficht which has always run rough, especially at higher rpm. I have had it in for warranty work and they don't seem to be able to solve the problem. It feels like I am dragging a bait bucket with what sounds like a popcorn maker, according to people on shore listening. I have noticed that when I am under a heavy load (pulling 3 water skiers or lots of people) the motor runs fine. It seems to be at its worst when I am alone in the boat and it is not under any load. Is there a load sensor in this motor that could be faulty?<br />Thanks