I have a 1987 mercury classic 50 on a pontoon boat that has some issues. In the water the boat had a lack of power. I took the carbs off , top carb had no fuel in bowel. I replaced the needles on both carbs and cleaned them. Noticed the bottom carb didin't have the air bleed jet in it so I replaced that. I also replaced all the fuel lines and filter. .Motor ran alot better but the idle was really high so I backed it down using the lower throttle stop and the cable adjuster . Previous owner must have done this to make the motor run to sell the boat . Now when you rev the motor up with the muffs on the RPM's come down slowly . Is that normal ? It also idles good and then develops a miss, could I have the idle to low ? Is there a tach wire I can set the idle with ? What else should I be looking at ? Thank you for any help. Joe