https://imgur.com/a/nBxUQuv here’s actual pictures of my car, 3rd picture has a numbered diagram.
Okay so If I disconnect the hose from 2 and connect the vacuum to it (meaning the hose is still connected to 1) it holds up to 25in. Both with the car off and at idle. It doesn’t cause the car to stall though.
5 runs between 1 and 4, but I can’t get it off. 4 also holds a 25in vacuum. 3 doesn’t hold any.
The only time the car seems to stall is if I take the hose off of 1 (leaving the hose connected to 2). When I put the hose back on 1 sometimes it stalls pretty hard, almost dies completely.