I have a 2002 Merc Opti 225 HP. It's having a problem thats driving my mechanic crazy and draining my pocket. The boat starts off running fine but after a while it starts to loose power. Once that happens she tries to go but can't get over 3000 RPMs. If you keep in under 3000 rpms it's ok but still not running strong. My mechanic has spent quite a few hours on it but he's coming up with no results. The latest he believes two coils are bad so we have them on order to replace. ANY THOUGHTS HERE?????