pro-mx runs terribly
 

I have a 2023 Mule Pro-Mx EPS that recently began to run very rough. It drove like the seatbelt wasn't buckled. It would buck, stall, difficult to start. I suspected bad gasoline in the tank. I took the tank out, dumped it out. Sure enough, a lot of rust in the fuel due to (I think) water in the gas can. I emptied out the gas, cleaned the inside of the gas tank as best as I could and reassembled it. It ran better for about a week, although I didn't test it very hard, and then the same symptoms returned. I had just filled the gas tank with new, fresh gas from a plastic container, so I know there isn't any rust in it. Can someone tell me where to look next?

Any help is appreciated.

Texasjerry