Hey all, new to the forum and having an issue with my 2016 6.7L megacab that I recently bought used. It’s got 55k miles and is bone stock. For about a month now, the truck surges noticeably bad at low throtttle application, especially when cold. It feels like the engine revs up and down quite a few times before shifting gears. If I push the throttle more, or let off more, it goes away. It’d does it with the tow/haul mode on as well. I also notice a slight surge when at highway speeds, usually around 60-70MPH. It feels like the truck keeps hitting a huge frontal gust of wind is the best way to describe it. Fuel filters were replaced 6k miles ago. No CEL ON. Took to dealer and they called me back the same day and said it was done....they did a transmission relearn and it was “fixed”. I insisted they keep the truck until the morning and have the tech drive it when it’s cold to reassure that was the issue. They called back and said it was driving normal. I pick it up today (Sunday) and it’s acitng like they did nothing to it, still surging. I had to take it home because the service dept was closed. Any one have any idea? Any help appreciated.