Yes, carbon can cause problems. If the PCV hose is collapsed, that tells me the hose is plugged or the pcv is plugged. The intake provides vacuum to the PCV. The pcv should allow the crankcase to be vacuumed back into the combustion chamber. If the hose is collapsed, either the hose is plugged or the PCV or for some reason (one I don't know of) there is vacuum in the crankcase.
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