I have a 5hp nissan 2 stroke long shaft that was sitting about two years. It would barely start so I purchased a carb rebuild kit and replaced everything even though all looked good. Now it idles pretty nice but when I put it in gear and start to rev it up it shuts down...even when its warmed up and choke off. Once in a while it will get close to 1/2 throttle but still cant make it. In neutral I can rev it up all the way no problem. I did take it out of the water and it seems to rev up full throttle out of the water and in gear...I did that only for a second since I know that can damage the water pump. Any ideas?