boat didn't run today

I need some help. Here's what I'm dealing with 03 Supra Launch SSV. This thing has been running flawless this season. I just got back from a week trip where we used the boat all week without any probs. I go to drop in the water today, friends came from 1.5 hours away to ride, and it doesn't run right. Here's what happened. I put it in the water, and my cousin drives it back from the trailer and ties it to the dock and leaves it running for appx 10 min before he shuts it down. Starts fine, idles fine, all seems normal. I get back to the dock, fire it up...starts fine, idles fine, I put it in gear and it sounds fine as we pull away from the dock. As I go to give it just a little gas it kinda bogs down and won't go. Put it back to neutral and everything looks and sounds fine, so I try it again...same thing. We tried this in neutral and in gear and at about 1500 RPMs it would bog down, my cousin described it more like a "miss", but I think it more a bog. Sorry no technical terms here. I notice temp is around 200, it normally rides around 170ish. Lastly, we gear it back to the dock and turn it off. Then fire it up one more time, still starts and idles fine, but neutral 1500 RPMS it cuts out again and then it started making a chirping noise so we just shut it down and pulled it out. This was a really sucky day. any idea?