My ski has a slight miss at lower rpm's, such as when it is on plane, but just barely cruising. I'm guessing around 20-30mph. It seems fine at higher rpm's but im not sure if i just can't tell then. I just put new plugs in it thinking that was the problem, it helped some but didn't fix it. Before i put the new plugs in i drained the gas tank completely and put fresh in before I ran it. My guess is that it is running a little too lean and is not getting enough gas. It tends to hessitate a second in midrange acceleration. Does anyone have any suggestions on how to correct this problem?