Beeman1221

I rebuilt my motor, and while I was hooking everything back up, I came upon this line. The line comes from the passanger side of the motor(looks like a vacuum line) to the driver side. One part of it connects to the brake booster, as you can see in the picture, and one little hose goes on the fuel rail, then there is this long line, with a hard pipe, then an elbow on the end. Can anyone tell me where it goes, I'm so lost, and I've been trying to figure it out for a week. Any help is appreciated!