What is the rubber hose (elbow) that comes out of the back of the throttle body that runs into the resonator and back to the valve cover?

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It’s a 1999 F250 with 5.4.
It’s a hose that comes out the back of the throttle body and goes to the bank 3 valve cover. It has a resonator in between. The hose is there but it must be missing a fitting that attaches to the throttle.

I can’t take pictures. Line in East Tennessee and we’re having 6-8 inches of rain between now and Thursday.

Oh wow, that's a lot of rain. There is a hose that goes to the rear of the intake manifold. Please check the image below; let us know how it goes.