I got my pony a couple years ago and ive done a good amount of work on her. shes always run a little rough but it’s gotten worse. Now she stalls out while idling after a minute or so. I can rev it to keep it going but as soon as i let off it slowly but surely dies. poking around i found a hose that pretty much just comes off with a slight pull. It’s crumbly and on the passenger side. it connects to the main air intake and is pretty short.

As far as I can tell this...

2002 mustang 3.8 v6 rough idle/vacuum leak