There is a nipple on the back side of the head, a vacuum feed of some sort. What is the purpose of it?
warm air circulator? Connects to the bottom right corner of the airbox. Completely unnecessary. Replace manifold gaskets and the injector rings if they haven't been done in the last couple of years. Cheap parts and may fix your problem.
wait actually I think you're talking about the valve cover nipple that points towards the rear. I will remove that if I can, but I'm actually talking about a smaller nipple that I think is down between cylinder 3 and 4.