Q: 2011 Ford Fusion idling rough and stalling out

The power brakes on your vehicle rely on engine vacuum. If a vacuum leak were to develop anywhere after the supply leaves the intake manifold, on its way to the brake booster, the engine could run poorly. To diagnose this possibility, cap the stub on the intake that leads to the brake booster, thus shutting off vacuum to the booster. If engine operation immediately smooths out, fix the leak (could be tubing, could be the booster). Alternatively, you can request a rough operation/rough idle diagnostic and the responding certified mechanic will perform the required diagnostic steps to get this resolved for you without additional hassle. With regard to the throttle body, although there was a Ford "service campaign", and indeed a government investigation of throttle faults on your (and other Ford) vehicles, there was never any official recall relative to the throttle body. To determine if your vehicle was included within the Ford "service campaign", simply ask your dealer although, in my experience, if you are not pointed and precise enough about it, they will give you an unreliable response. What you can do is give your VIN to the Mechanic in the event that you seek a rough operation/rough idle diagnostic and the Mechanic will get that aspect of your inquiry straightened out. If you have further questions or concerns, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you to get the best possible results.