Found your earlier post, which provides some more info. I was going to ask if your vcv valve was holding vacuum, but it apparently is. Have you checked all of those three-way vacuum connections to see if they have a tiny crack?

I've actually bought one of those three-ways, only to find out that there was a manufacturing error when it was made. I had to poke a hole through one of the openings so that it could actually pull a vacuum. Might want to check to see if they can hold a vacuum, and then to see if they can actually let a vacuum flow through. I'm not sure if I'm being much help, but sometimes this stuff just takes working through the system.