Cars shuts off when you take foot of gas pedal

Lisa,

There are many things that can cause a vehicle to stall at idle (foot of throttle). For example, a faulty idle air control valve, engine vacuum leak, and so on.

When the vehicle is being used, are you able to keep the engine running by feathering the throttle when stopped? Is the check engine light staying on when the engine is running? Have you checked for vacuum leaks? I ask because since there was a lot of work just done, a vacuum hose could be off causing an idle related issue.

Let me know as much as you can. Also, take a look through this link and let me know if it helps.

https://www.2carpros.com/articles/stall-at-idle

Let me know.
Joe