why wont my truck stay running?

[Squareforceone]

I had to take my qudrajet off a couple days ago and when I put it back on now the truck won't stay running. It'll start idle sort of high then die. I had the carb flipped upside down to scrape old gasket off. I replaced the carb gasket thinking that was the problem nope... checked a bunch of vacuum lines they all seem fine... then realized my choke is being weird it'll stay running if I hold it almost all the way down I can't seem to adjust it its a vacuum choke. I'm stumped as to why this is suddenly and issue.