I don't know if this applies or not, my father was having a similar problem when snowblowing. The engine would slow right down and snow coming out would barely clear the chute. I found the arm on the governor shaft had loosened up and the arm was moving independently of the shaft. readjusting the governor to specs and tightening the bolt on the arm, restored proper operation and it ran for several more years.
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1989 - Cub Cadet 1772
1987 - Cub Cadet 1572 w/Rear PTO & Cat. 0
38" Lawn Sweeper #196483
42" L42 (Bush Hog) Rotary Cutter # 190349
45" 2-Stage Snowblower # 196364
48" Haban Rotortiller Rear PTO Driven #190356
54" SnowBlade with hydraulic Angle #196376
60" Haban Mowing Deck #196374
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