I'd start with the plug, as it's an easy fix if it works for you (it didn't for me). Next try the hose fix as detailed in the video. What worked for me was to check my valve clearances, which were both tight. Adjusting them transformed the bike. It hasn't stalled once since then and it idles nicely at all times.Did you find the irridium plugs helped the bike all around or only for starting and idling?