Bike has been getting harder to start, rough idle especially when cold (well, what constitutes for cold here in Phoenix :lolrolling), pipe is sootier. Once running, seems to run ok. Diagnostic code PO261 - Front injector open comes up. First, is there another test that I can run to verify the injector is going bad? Second, as long as I'm in there should I go ahead and replace the rear? Last, is there an alternate source for this particular injector or just go through Zanotti's? Also, after I cycle through the code, this scrolls through Pn 32733-04A, any clues?