I have a 1990 2.5. There is thee holes on the top outside of the valve cover.1 for the oil cap, 1 for the pcv, and 1 for something that goes from vale cover to air box. My question is the baffel or what ever it is inside of the valve cover broke off. The one hole that goes to air box. It was hitting the rocker arms so i took it out the knocking sound is gone now i have oil everywere. Can i block this line off what is its purpose anyway.