Based on what I can find through searching the web, I would think that I'm having governor trouble, but I find it odd in the way that the problem occurred. To start out, I have a Great Dane Super Surfer II with a 23hp Kohler engine. I was mowing along today and everything was fine. I stopped to prune a tree limb, cut off my blade, engaged my brake, and throttled all the way down to idle. The mower began to die, so I reached over and turned the throttle all the way up. It recovered stayed running, but it seemed to be missing terribly. I jumped on and booked it to the garage, because I didn't want to be pushing this thing up my front yard. I tinkered with it for a while, checked the spark, checked the compression, made sure I was getting a good supply of fresh fuel to the carb. The engine actually seems to run fine when I'm accelerating or when I first turn the blades on. Obviously when the engine is under a load. But as soon as the mower gets momentum, or the blades reach full speed, the sputtering and missing start back. The problem was so sudden, that I wouldn't think that it would be the linkage coming out of adjustment. It's almost as if something broke. What do you guys think?