Reverse issue with a 97 150 Fast Strike

A while back I was having problems like a lot were with my motor having issues accelerating when it was hot and not ran for a while. I followed the instructions on the throttle arm and made sure the gas was clean, and that solved the issue. Lately however I have noticed that when I put it in reverse, it almost sounds like it is barely running. This is really prevalent first thing in the morning and the boat will die a few times before I can baby it off the trailer. I almost ran into a dock as when I was pulling up and put it in reverse it did die on me. Luckily I don't come up to docks quick and was able to hold it off. It runs great in forward and sounds like a totally different motor when shifted from reverse to forward. Am I looking a throttle linkage in reverse needing adjusting or what should I look for. I did have all the carb bowls replaced this spring and had them adjust the shift linkage, but had to re-adjust it myself as they had at that time totally taken out reverse. Thanks for all the help so far from this board.

To make sure you have it right. Remove the right hand side lower engine cover and remove the shift cable from the linkage. Verify that when the engine is in neutral the prop spins freely and that the linkage arms are both perpendicular and parrallel to the crank case split. Now adjust the black trunion knob on the shift cable so it goes on the post with out forcing it. Tighten the lock down bolt and connect the pin on the post spin the prop with your foot while an assistant moves the shift selector between gears while pausing in neutral. You may also want to inspect the shift interruptor switch located under the shift linkage on the motor side.