ChromeK2XX

Has anyone found a solution for this? This sounds identical to what my truck is doing. It's been going on since I purchased the vehicle and it's getting worse. I've brought it to the dealer multiple times and they don't experience the issue. Last week it got into it's sputtering fit and stayed there longer than normal. CEL and Stabi lights popped up and flashed for about two miles. Dealer pulled codes for misfires and recommended Top Tier fuel. So now I'm using Super Premium TT, yet issues persist. Lately, it feels like I'm adding more pressure to the pedal and getting terrible acceleration response (since CEL notice). Something is definitely not right, and I want it fixed before it's a bigger problem.