86 chevy astro vacuum leak

I just put new plugs, plug wires and a pcv valve in my astro. Now when I press the gas (with the inside manifold off) I can hear a sucking sound. Also I do have a lot of old vacuum lines and one that is broken and I can't seem to find where the other broken end is. Does anyone have a vacuum diagram for this? It seems like some of the horse power is gone, could it be the EGR valve (and where is that located)? Please help me!!!!!!!!!!!!!!!11