I have a fitting on the back of my intake plenum which swivels or is loose.It is not the PCV fitting but is the fitting directly above my EGR.Should this fitting swivel or is this a potential vacuum leak.I cannot tighten this as there is a tube protruding out of the fitting which butts up against the plenum.Do I have to remove this tube first and then tighten the fitting with thread tape/sealant.