03 TRX350TM power issues

I’m having power issues with my 03 rancher 2X4. Starts fine. Idles fine. When I get going up into 2nd and 3rd, the throttle doesn’t seem to do much. It’s just barely going. It’s always ran and started fine. I did replace carb last year, but other than that, it’s been great. I use ethanol-free gas and run it out every time I shut it down. So, I give it gas, it revs up, but doesn’t really accelerate like it use to. It never sounds or feels like it’s about to cut off, just moves sluggishly.

I did look in the air filter box and there seemed to have been a lot of fuel in there…

Any suggestions? Thanks in advance!