Hi and thanks for using 2CarPros.com.
If I understand correctly, it stalled but restarted and has been fine since. Is that correct?
If that is the case, many things can cause such an issue. If the air conditioning was on and temperatures were really high, there could have been a heavy drag on the engine just from the compressor, alternator, power steering pump. A slight delay from the idle air control valve may have allowed the rpm's to drop low enough to stall.
Also, if there is a problem, in most cases the check engine light would have come on to indicate a problem. Has that happened? If is has, here is a quick video showing how to retrieve the codes:
https://youtu.be/YV3TRZwer8k
If my understanding is correct and the check engine light did not illuminate, there really is not much that can be checked until it happens again or it refuses to start.
I hope this is helpful. Let me know if you have other questions.
Joe
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Monday, July 9th, 2018 AT 6:45 PM