I looked up your carb online, it does not have the electric fuel metering rod so I don't think that is the issue like it was with my 2185. The next thing I can think of is possibly your coil is going bad, or one side of it is going bad. I know someone here had an issue with the coil on their twin engine causing about the same issues that you are giving. Maybe they will see this and chime in.
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DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
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