This isn't a Grand Prix, it is actually for a Grand Am.

The car has been running kinda rough, especially at idle. Already changed the Plugs and Wires but it still idles rough.

Looking at the engine bay, I came across a broken Vac line. Which I assume must be the problem.

The question is, where does this vacuum line lead too? I cannot seem to find the end of it so I can replace it.

BillBoost to the rescue?