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Good question. I don't remember if there was a body plug there before or not. I think there may have be been one and I enlarged it, the other 2 hoses are the vents. Sorry for the bad quality. For some reason the picture quality is reduced when I upload the pics.
Why? So what if the valve is open at idle. All it does is allow more fuel into the main well. Once I start moving the vacuum goes up so the valve closes (still running on the idle circuit). Runs great.
I run a 9.5 PV with 4.5 inches of vacuum at idle. Works great. When cruising I have 13inches of vacuum. Anyway...that little flutter could be because you're to lean. Have you looked at the plugs?
I swapped out power brakes and power steering. Cleans everything up in the engine bay and I don't find it bad at all driving around town. 67 RT with HEMI. So it's no lightweight.