Yardman 1996 lawn tractor Kohler MV20S engine. Wasn't running smoothly, it would idle up and down. I new it was carb. related. Cleaned carb. Idles fantastic now until I move or shake the tractor, then it stutters until I stop moving. Now what?
Ill check this out.Also check the fuel tank for water.
A little layer of water in the bottom of the tank will also do this
As will the cut out wire if it has a bad spot in the insulation that can short out on the mower.