I have a 2210 with 85 hours. Over the weekend while moving some gravel with the blade the rpm would slowly drop and the throttle lever just moves back by its self. I had is set at 2500-3000 and within a couple minutes it would just slide back to about 2000. Just push the lever back up and it goes back. I checked the cable and that was tight and no signs of slipping. It almost seems link the spring on the linkage is too strong all the sudden. I was going to try to tightent the bolt holding the lever thinking it might be a little loose but I ran out of play time yesterday. Has this happened to any of you?