The problem that I'm having is the gear shifter located on the lower section of the out broad motor is not responding to the command given at the main throttle control located on deck. I also noticed that when I'm trying to change from neutral, drive ,and reverse the throttle button gets jammed and won't allow the conversion. If the boat does go into drive or reverse it kills before converting back. The only thing I had done was change out the impeller, which after being reinstalled had the gear stuck in drive. I then pulled the lower portion of the outboard motor back down, reinstalled, and it is now struck in neutral. I have checked gear oils which were low but have been topped off. Nevertheless I'm at a lost, yet feels that I'm close to the solution. Any ideas or advice......?