Purchased a brand new 2021Trail Boss 5.3L today. Had 3 miles on it as it was fresh off the delivery truck. While sitting in the garage at the dealership the sales rep and I were in the truck doing the OnStar welcome call as it was idling. The idle got rough and then it die. Restarted it and it rough idled and died two more times. Was able to drive it over to service across the parking lot to have them look at it. The code said it was not getting enough fuel to maintain normal idle but that was it. After 30 mins, service said they couldn’t recreate the problem anymore and it was probably air in the fuel line getting cleared out. I drove home and although it seemed to idle fine it feels like it’s missing a bit when putting a load on it. I’m going to drive it for a couple more days to see if it’s just breaking in or something.

Has anyone experienced this or know what might be going on here?