There are T-shaped vacuum connectors under the intake manifold that can break and cause a rough idle.
Average mileage: 143,833 (106,000–177,000)
Engines affected: 2.3L V6 Supercharged, 2.5L V6
15 people reported this problem
We replaced the valve cover gaskets, and after putting everything back together, the car stalls after idling for a few minutes. After restart, it stalls more quickly.
Car was in for service and the next day it began to idle rough. I brought it back into the shop and they identified that the t valve had become cracked and was causing a vacuum leak. The mechanics denied any wrongdoing and so I took the car to another shop to repair the issue. Not saying that they broke it but their ice cold bedside manner didn't provide enough reassurance for me to keep shelling out perfectly good benjamins to suspect mechanics.