Yesterday as I approached a bridge and tried to slow down, I couldn't (17 foot Carolina Skiff). I could not get the engine into neutral. Felt like a stuck shift cable. I had to do circles, finally forced it - reved real high. I immediately turned the ignition switch off and trolled it back to the dock. Two weeks ago ran perfect. {Once before I could not shift at the when putting it in the water - took it in to mechanic, they greased it up, worked fine.) When I got it home, took the engine cover off. Still grease in the right places. I tried the shifter control - everything appeared to be working. It went into forward, back to neutral, to reverse. I tried it over and over, no problem. Ran the motor and tried the shifter again, everything worked perfect. I greased it up again. Don't see anything wrong. I will say that at the boat ramp when I reverse it off the trailer, then shift to forward it often squeals. It has been doing that for a while, but never does it when testing on the trailer. Any ideas?