Trying to trouble shoot a ‘97 Xplorer 300. Bogs down when throttle applied. Machine was fine in May, went unused for a month or so. Problem appeared when fired up in June. Will run ok when initially fired up. Seems to idle ok. As machine is used gets boggy. Initially thought clutch might be problem, however bogs in R, L, H, and Neutral. Not sure where to start. Ran fine all fall and spring. Going to look at and replace plug, but suspect it’s more complicated than that. Any suggestions where to start and how to proceed would be much appreciated.