1988 mustang H/C/I car. The previous owner removed the fitting from the throttle body that the hose attaches to that runs to oil filler neck on the valve cover. He had the hose attached at the oil filler neck and run down towards the ground venting to the atmoshpere. Soooo i have unmetered air coming into the engine. The throttle body where the fitting is supposed to be is capped. Can I just cap the side of the oil filler neck or will this cause too much vacuum in the motor?