I've got an 89 mercruiser 5.0, the boat is going forward when shifting to reverse, it's also going in reverse when shifting into forward, sometimes it goes into forward when shifted into forward, sometimes it won't shift in foreard at all and sometimes it starts right up with control in neutral and is already in forward and takes off, and it has also not engaged until the engine got to 2,000 rpm and jumped In gear and took off. I tool the gear cable off at the bracket on manifold and that forward cable is nice and tight and pulls/pushes as it should, I also checked to trottle cable which seems fine, I took the lower shifter cable off at the manifold and I can freely move it with 2 fingers with no resistance and don't feel it changing any gears, while having someone changing gears I listened at the lower unit and it sounds like something (possibly the slide) is moving when going from foreard to reverse. Any help would be appreciated!