I'm dealing with this issue right now. DO NOT DAMAGE THE HOSE ANYMORE! It runs inside of the intake manifold and is glued in place. You can't replace just that hose. Best advice I can offer is to get down where it isn't brittle anymore and put in a double sided nipple to connect a fresh line to it. If that line breaks at the base then you'll have to use a hose barb or buy an entire new intake manifold.