Residue around inside of filter and throttle body?

This ones stumped me a bit. Trying to locate the source of this damn problem with the overrun, and when I whipped the k&n off it had an oily residue around the collar, and on the butterfly.



On starting it up, you can see there's a vapour that's coming OUT of the throttle body?!



Now call me mad, but how the crap does vapour blow out of a throttle body? Any ideas because this clearly isn't right! A blocked breather pipe perhaps?

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