Help Identify tube near manifold

[J Fender]

Have an 02 GTS, was changing the water pump after having the Viper for 4 years. Runs with no noticeable issue. While changing water pump noticed what appears to be a white vacuum tube or plastic line underneath the manifold on the drivers side. It looks like something was once attached. There is a capped vacuum fitting on top of manifold. Can anyone advise, thanks in advance. See attached picture.

 

[haneifk]

Probably PCV. Trace it back to see where it goes. Should stop just behind the thermostat housing. Look from above, thru the spaces in the intake manifold. Originally connects to rear LH side of air cleaner box.

A lot of people plug theirs or route to a catch can if they do track days, etc. Otherwise intake runners get flooded with oil.