What a toughie . I'd clamp the pcv line shut & try it then clamp the booster line shut & try it (can do those 2 in minutes). next I'd consider replacing the intake manifold gaskets using composite side gaskets with Permatex "high tack" the red spray in a can, goes on light and seals very well. Holler what it ends up being

live every 24 hour block of time like it's your last day on earth