It is the nipple toward the front to the front the intake manifold. It had a small piece of hose on it with a plug in the end. Should it be going somewhere? When I pull the plug off, the RPM's jump up, then even out. If I put the plug back in, the RPM's drop really low almost like the engine is going to die, then they level out.

p.s. There is a little suction to it too. A little nipple suction.

 

you see this fitting in that area

 

look around under your hood for a vacuum line chart

 

Good call. Chart says its not used. I guess I'll just leave that plug on it.
Ty.

 

there ya go