Is there a vacuum line under the intake manifold? S4 TII manifold.

My car is running a little lean and idling high so I established I have a vacuum leak. I did the good ole spray carb cleaner to find vacuum leaks method and there seems to be one under the upper IM. It might be the rear secondary injector o-ring, I hope not cause I just replaced them. Or a mysterious vacuum source under the manifold that a cap may have fallen off when I had the IM off.

Thanks