Sorry if I'm being unclear. Here's what I did:
1. Broke crank case vent hose
2. Broke entire valve cover (it came off in pieces, wtf)
3. Installed new valve cover and gaskets
4. Removed IM and replaced crank cent hose
5. Reinstalled IM, and all other parts
6. Start car and hear ear piercing hissing and violent idle surge
I think idle surge may be cause by crank vent hose and hissing by improper IM installation / bad gasket. Seem reasonable?