How do you reset this code??

 

That's a random misfire detected.

I would check on the condition of the coils and plugs before dismissing it.

 

Yeah, I decarbed it and the check engine stays on and this is the code. I have done it before and it went away after a while

 

The only way to clear the code is to use an OBD scanner or disconnecting the battery for a bit. I personally left it disconnected for more than 30 minutes

https://www.rx8club.com/series-i-trouble-shooting-95/real-way-clear-memory-169443/

If you go for disconnecting the battery. Then make sure you reset the DCS/TCS since that will need to be done after connecting the battery back since that light will be on.

https://www.rx8club.com/series-i-trouble-shooting-95/have-abs-dcs-tcs-issues-lights-staying-202843/