This could be a couple things. However, here is a guide that will get us started:
https://www.2carpros.com/articles/engine-stalls
The fact that this does this only on rough roads, we have to assume there could be a wiring issue. So we need to start with checking the ground for the PCM G108. It is on the radiator support. I would remove it, clean the support and the wire and reconnect it. This should be an eyelet ring with a bolt through it.
Let's start with this and then retest it and see if it still shuts off.
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Saturday, December 12th, 2020 AT 7:10 PM