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Try cleaning the EGR valve.
This could be a number of things and needs to be checked out with machines,
Possibly the Head Gasket is blown.
Maybe a throttle positioning sensor? Is it hard to start? Does it start then stall?
It stalls even when warm
check pcv hose elbow for vacuum leak.
A vacuum leak would do that. Check the base gasket under the throttle body.
I would not expect a valve cover leak to cause a car to stall. A valve cover leak can fill the spark plug area with oil which can cause rough running.
air leak
air leak
AC runs on the battery. If the car is off and you run the AC, then start the car, it will stall.
No , It would be nearly impossible.