I reckon that's a crank breather hose you're seeing that's split... But shouldn't really be your problem, they can cause running problems if they're blocked, but holed, no (but still very bad news, since they're open to the crankcases!) I could be wrong, though.
I've nothing constructive to add as to what's causing it though, sorry...
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"We are the angry mob,
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We like what we like, we hate what we hate
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