I've got a 1996 Johnson Venom 200 on my boat and I was going to get it serviced. I've had it since Sept. 07 and it's done pretty good. I've read where some guys say there's is cold natured. Mine starts pretty fast, but when I take off to get it on plane it seems a little sluggish. Is that something that servicing will take care of ? When it gets on plane it runs great.