luke,

sounds like a breather line

if that line is popping off you will more then likley have a blockage on the hoses somewhere, or your catch can is hooked up incorrectly.

if it is actually hooked up to your manifold, it may be the PCV valve stuck open. in any case, be careful as pressure on the crank case breathers will result in pushing the rear main seal.

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Long live the WRC