Hello, recently tore into my truck a bit and can't for the life of me figure out where this line plugs into. I found this image from another post since I don't have a pic right now. Basically looks like the two red ones highlighted there. It connects to the vacuum line that runs to my EGR and it looks like this highlighted one must go somewhere near the intake manifold? I have a 96 2.3l ranger.

Where does she plug in at lol?

 

The red lines plug into the side of your intake manifold. Should be a male connection protruding from the upper rear of the manifold.
Your other line (right side) connects to a yellow vacuum line over to the drive side of the firewall.
Your far left line should connect to the top of your EGR valve. However, your male connection on the top of the valve seems to be missing.