I have a 2001 K1200LT with 39,000 miles. It's always been running flawlessly...UNTIL TODAY. I rode it to work and I noticed an intermittent engine hesitation. It seems most noticeable at 1700-2200 rpms in 4th & 5th gear, especially when accelerating or climbing a hill (happened twice in 3rd gear, too) but it doesn't happen all the time. I've tried to duplicate the problem on the same hill at the same engine rpm, but it happens randomly. I've also noticed that if I hold the throttle at 2500 rpm while parked, it develops an engine rumble...not severe but noticeable As far as I know, the plugs and wires have never been replaced. Any suggestions or advice would be very helpful and greatly appreciated.