I have a 17 silverado CC z71 and I'm experiencing the same surge type feel. I had a 14 cc, which did the same thing, but not near as often as this 17. Almost feels like a misfire. I've had my truck since December 2016. ONLY ONE DAY, it didn't do it at all and I was very very stoked at how good the truck drove. I gave it 3000k miles to go away, but the surge/hesitation is still here. Scheduled to take my truck in Tuesday. I may force them to keep it till a fix is avail. It bug the heck out of me that these trucks do this as bad as they do.