low rpm in high

Hi everyone, this is my first post although I have fallowed the site for a while. Had numerous quads but this is my first utv(15xp1k). I recently went on a ride and went through some creeks and had a check engine light come on. I didn’t have anything to write the code down so Im not sure what it was since its now cleared. Ever since then my rzr feels underpowered and will only hit 8000 rpm with the stock tires. Only performance mods are iridium plugs and queens ecu reflash. It will hit 9200 rpm no prob in park and also in low gear but only 8000 in high. Any idea what the issue is? Air filter isn’t that dirty, checked and cleaned the pps, and checked the spider nut on the clutch. All seems fine…