I found that about a year ago or so on a Jeep forum. It's the first time I've ever seen it explained to where I could understand it completely and it made sense. I wish I knew who wrote it so I could thank them.
Me too. I understood some of the function, but not the reason for manifold vacuum. I suppose, it's because I was raised doing service work on everything that had ported vacuum from the factory, so that's how I always "assumed" it should be. You know what they say about assumin stuff. lol Thanks for that. Very useful information.
