egr tube has two vacuum lines taking off it ,where do they go

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i have a 1999 crown vic,185000 mi.,it idles rough and has power issues at times when excellerating,it seems sluggish,i replaced the fuel filter,the intake , because of the thermostat housing was cracked after taking it to advance and putting it on the diognostics,the egr valve popped up,i got to looking and there ia an exhaust down on the egr tube,two vacuum line takeoffs are with nothing on them,i did not remove nothing from there,my question is , what hooks to these two lines if anything,or are they supposed to be plugged,thanks for your time