I have a 1988 OMC Cobra. It will shift into forward but not reverse. I disconnected the cables and they work fine forward and reverse. It overheated last time out and after changing the impeller and housing, plugs, points, cap, rotor, and fuel filters, it runs fine and shifts normally into forward. When you bring it back to idle it runs rough because the shift interrupt switch (right name?) near the end of the shift cables needs to move into the right position on the fork like bracket. I noticed the plastic bushing seems to have some play in it or it just may need some adjustment. I could use some suggestions. Thanks