That ripped line thing on your last pic in the first post is most likely to be the vacuum line for the idle actuator when you turn on the Air Conditioner. Seeing that your car has no AC (at least, not anymore) it's possible somebody has taken the idle control unit out and leave the vacuum actuator on the car.
Thank you so much for mentioning that - since the factory AC was disconnected and removed, that thought didn't even cross my mind. I'd say you're correct, I'll make a point to just plug the open port.