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This can happen as the result of a vacuum leak, EGR valve not closing properly, or even a dirty throttle valve.
First thing you'd need to do is eliminate the obvious by conducting a thorough visual inspection of all vacuum hoses in the engine compartment. Repair or replace as necessary.
If the visual inspection did not reveal the cause of the stall, next thing you'd need to do is to spray carb or choke cleaner on and around the EGR valve and the intake manifold with the engine running at idle. You'd have found the problem if the engine smooths out while you're spraying a particular area.
Please let me know what you find.
Awesome! Let me know how it behaves after the road test.