Originally Posted by spduffee
I can't seem to upload photos, but I think you'll all know what I am talking about. There is a manifold port in front of the carb with a 3/8"/ 1/2" hose going to the master brake cylinder. On that same port there is a small nib that I just realized is sucking in air. It has no hose on it. I stuck a piece on so I could play with it and sure enough, when I plug it, the engine runs smoother.
Looking at the vacuum diagrams, I don't see any mention of the brake cylinder, but it appears this port goes to the carb bowl, non-linear valve and the HDC CTO. This is how I found it. Is there any reason for this port not to be plumbed? I think I may have to go buy all new vacuum lines and start over.
Year, model equipment? Makes a huge difference in the vacuum plumbing. You could put that info in your signature file so it's in every post. Generally speaking you should have no open vacuum ports, whether they are connected to something or plugged.
The forum will not host your pictures, Put them somewhere online where they have a URL and post the link or post a hot link. You will get much better info if you figure out how to post pics.
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