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Update: Tried the intake leak test by spraying carb cleaner at the cylinder inlets.. No results, no change. Figured out that removing the tank was not crazy hard, some fender screws and loosen the fender. There's a frame mounted plate that holds the tank in. Nothing crazy in the tank except...

Losing my mind on this one.. Engine is an FR691V-CS05 on a roughly 10 year old Cub Cadet RTZ 50. Behavior: Starts and runs good, when cutting under full power the engine starts missing a little then goes down on power.. Stop moving and the engine comes back. Seems to get worse as the engine gets...