as a car gets older,these smog devices go fast.Egr is controlled by vac,some car use hard plastic lines that break,and leak vacuum.PVC system is usally the crankcase is under vacuum too.The lines rot,and some valve go bad.Your crankcase has to expell pressure from blow by gases,either into intake or the air.You could by pass and block vacuum lines,and let crank vent to air,until you buy lines,and anti blow back valve.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt