My K100RT has a rough idle, with a miss occasionally and also at about 2000 rpm which is about 35 mph it has a surge. I spoke to a old time BMW owner and he said the surging has been a problem with K bikes at about that RPM, anyone else expierence this. I changed the plugs but has not made a difference in the rough idle, seems more like a fuel problem to me. When you roll the throttle on everything is fine and no surging or misses at highway speed. This is my first BMW so I am still getting used toall of its actions.