Yeah tried old plugs- no difference-
Last time I rode bike before cosmetic refresh was a month ago now and from memory it rode fine , maybe battery seemed a little flat when starting? but nothing to make me think it was dying or mech problem looming.

3 way splitter was brittle and has been repaired with superglue before- not sure if it was broken when I took airbox off or it just crumbled when I disconnected the airbox?