Look under your hood, upper right corner as looking in.
There should be a label like this.
The line you are referencing goes to the TVV, (Thermal Vacuum Valve).
Its a valve that only opens above a certain coolant temperature that draws a vacuum from port P to the VCV allowing vacuum to be applied the charcoal canister. When the VCV functions via the TVV, Fuel fumes trapped in the Canister are burned off by being sucked into the port closest to the intake manifold through the throttle body.
Thanks, but that isn't what mine looks like. I'll snap a picture this morning. From the very few pictures I can find of the underside of the upper intake manifold, from what I can see, they are all capped like mine, but it's a bit hard to tell. In the first post, the small red circle on the LH side appears to show the cap I'm talking about....that is, it isn't hooked to anything, but rather is blocked off.