Kilted

Good morning Canyon and Colorado owners. I have searched through this section regarding my issue and found a few posts similar to this issue but no definitive solution. I now have 201,000 plus miles on my Canyon. I have put every single mile on myself. Up until two weeks ago the truck has been flawless. On trip to South Carolina I noticed the engine/transmission would stumble, sometimes violently. Tee engine has never stumbled to the point of dying. I took the truck to the dealer as soon as I could and they could find nothing. Since then I have been paying attention to when the stumble occurs because it can be quite random. Cold engine, warm engine seems to not matter. What I have noticed though is that the stumble always occurs at or below 2000 RPM and usually when I have lifted my foot off the accelerator and then applied light pressure to re-accelerate. Any insight you may have would be appreciated.