I have a 2185. When mowing it will run fine then all of a sudden it will idle down (not stall or even sound like its going to stall), after 30 seconds or so, it will idle back up. Or sometimes you have to shut the deck off, then turn it back on and it will be fine for awhile then do it again. If I am mowing for about 3 hours, it will probably do it 4 or 5 times. It really doesn't seem to be a fuel problem, but I am not sure.