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we've got a 01 700 rmk thats been running great for the last few seasons. on the last ride it blew a belt and since thn it has been running poorly on the low end. it starts great, but off idle acceleration is very choppy, and it backfires when letting off the throttle. it runs good from mid to wot but i noticed a loud uneven idle. the plugs look good, and i've tried different ones with no change. the sled has about 1600 miles on it and i cleaned the carbs back in november. any help is appreciated. thanks, tom.