I have never had one problem with my Yamaha until the last few trips out. It has been very hard to start, then when it does it runs rough for about 15 to 20 minutes or so or until I can open it up. After that it seems fine the rest of the day but still can act up a bit from time to time. This motor has always run like a scalded dog and never has acted this way. Plugs are two years old maybe that's the deal? Also my dang gas gauge just suddenly quit working, time for a new boat, LOL. Any ideas from you guys that know more than me, I'm far from an outboard mechanic, lol.