Well got towed into the marina this weekend..... I have a 1987 Four winns hoizon 190 with mercruiser 3.0 engine. Has run great for me all season. This weekend we were out boating all day and we decided to stop for a swim. When i turned off the ignition key the engine sputtered a couple times before shutting down.... When we were done with the swim, i went to restart and it would crank over fine, but not fire up. After several attempts of starting (10 minutes) the battery finally got tired and i had to call for help. A similar situation of sputtering before shutdown and immediately followed by hard to restart has happened before , but i was eventually able to get it restarted that time. Any help would be appreciated!!