Im almost at the point of getting a honda!
I'm guessing you mean 5 inches of vacuum? What's your vacuum reading right off the intake manifold? If it's 5 inches, it's way, way low unless you have a monster cam.
It's so freakin' hard to diagnose a problem over the net. When I was a professional mechanic, I would use all of my senses to track down a problem. What does it SOUND like, does it SMELL rich, where do I FEEL the vibration, what does the exhaust LOOK like. It really is a ***** doing it this way. To bad you don't live closer.
Good luck and let us know if you come across any more information that might help us help you.