2014 Moomba Mondo with Indmar 330. Just got it 2 weeks ago, 3rd time on the water with it. First issue.

So at the pumps this weekend my buddy offered to fill it up and he put 87 in it. I forgot to tell him to put 89. Not sure if that’s what has caused this but after about 15 minutes on the water we were going about 40mph and engine started bogging/misfiring(?) and I cut the throttle down and it smoothed out around 3k RPMs. I opened it back up and it started sputtering so I backed it back down and turned back for the dock. It stayed at 3k all the way back with no issues. No fault codes or warning lights. When I got to the dock and put it in idle it stalled. Wouldn’t restart. Today it will start but it’s a very rough idle and stalls shortly after. I’m thinking it’s bad gas or that the 87 octane is causing it. I plan on draining the tank which is 3/4 full and putting 93 in it and seeing what it does. Any other suggestions on what it might be and does anyone think 87 octane would cause this issue?

Thanks!