1987 60hp Mariner starts good and runs WOT but I have an intermittent problem going in and out of gear. The neutral idle is smooth and I can rev the motor in neutral without any stumble. When I slide it slowly into gear it will quit. Or sometimes after running wide open without any problem when I shift back to Neutral it will die. However most times it will run good at idle speeds if I am able to get it into gear without stalling, also after backing down from high speeds.<br /><br />I've cleaned the fuel filter, change plugs, run from an external 2 gal tank with new premixed fuel(I have a mixer on board) and replace the primer ball. I have had the carbs off and cleaned them but I am not an expert so I don't know if I cleaned them well or if it needs a rebuild or rejetting. Seems like its a carb problem but I am a rookie at adjustments or rebuilds.<br /><br />Thanks guys.