Try his easy check.
With engine idling, slowly increase rpm until it starts missing then manually start to slowly close the choke to see if it evens up or if you have an automatic choke use your hand to slowly partially to fully covering over the carb to see if it evens up.
If it does you have a carb problem, probably blocked main jet, power jet or internal passage.
If it doesn't you probably don't have a fuel delivery problem and need to pull the valve cover and check valve adjustment and operation.
Good luck
