Vacuum line??? I'm not really sure what your talkin' 'bout, but there is a brake boost and another vacuum line behind the Intake Manifold. Also, there is a vacuum line coming from the crankcase that connects to the right side of the manifold. The only "line I know of the connects to the TB is the one that runs the antifreeze through so it dosen't freeze the butterfly when it's cold. Be a little more specific on what your looking for.