est. on tune up & replacing both upstream 02 sensors.also a massive vac leak??? on 1998 Lincoln Navigator

massive vac leak @ rubber elbows or hoses goin to PCV valve? how much trouble,time,and money am i looking at? plugs,boots,coils for a tune up and labor cant be cheap or can it? please help, need my truck running as good as it can be!!

Asked by for the 1998 Lincoln Navigator