I've recently rebuilt my '03 (new crank, and all bearings). I also added an hour meter. I finally took it out for a good ride since its been rebuilt, and I'm noticing a miss or stumble at a specific rpm. My best guess is its at 75% throttle. I first noticed it while cruising down the road, but checked it in other gears and it does the same. It has lots of power up to this spot, then stumbles a bit, then lots of power out the top rpms. I have also started running premium fuel in it, I ran just pump gas in it before it blew up (I know, I know). Where should I start? Is this likely a jetting issue?