Cub Cadet 7360SS - Black Exhaust Smoke; Erratic Idle Speeds

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Problem 3 : Black exhaust smoke
(1)Items to be checked for ahead
• Clogged air cleaner
• Poor quality fuel
(2)Inspection procedure
Problem 4 : Erratic idle speeds
(1)Items to be checked for ahead
• Maladjusted engine control
• Wrong oil grade for weather conditions
• Poor quality fuel
(2)Inspection procedure