I have a 2021 Sierra Elevation with 60k miles. Bought it just a few months ago and it ran very smoothly. About a week or so ago, I noticed a subtle but noticeable vibration running through the truck both at idle and when accelerating. I’m not getting any error messages. Any ideas as to what may be causing this now? Could it be something as simple as a bad batch of fuel? Is this just normal and might go away eventually?