I have a pretty clean Force 125 that runs like a scalded dog when she get's my 18 foot Capri up to speed. Problem is that when I throttle up she'll pick up a bit and then set there for as much as 5 or 10 mins then suddenly she'll begin picking up gradually until she suddenly revs fully and takes off. If I slow back to 2 or 3 mph, I have to go through the same thing again. Once in a great while, she'll jump right onto plane. Any thoughts? Thanks! John