Cwjames

A little late joining in, but I purchased a 2017 sierra 1500 in June of this year. Amazing truck! It took a week or two to really tune into an issue similar to all of yours. The morning drive to work was great, and generally the evening drive as well. Though the days there were lunch errands to run, I noticed this funny hesitation, it drove like my old '89 on a rainy day! Tuning into this, I pushed the issue and would unnecessarily drive the truck at random times. (This is summertime in northern Michigan temps). I had pinned it down to any startup 3-7 hrs after a full temp drive. Any sooner, all was fine, any later, no issue. Once fully warmed up, I have no issue. It's an odd, partially cooled engine issue, only happening at low rpm. Slow acceleration through the parking lot and onto the road. I could push through it by stomping on the accelerator, but it just makes for nonsense, uncomfortable accelerations. I have watched the dash for the v4-v8 shift, there is no correlation. Never happens at speed, like on the highway in some reports. I also tow boats and campers with no issues once warm. I took it it to the dealer, they could not reproduce, of course, and did a system update in hopes of fixing the problem, claiming the transmission needed to learn my driving habits. No fix! Back two more times, they claim it's an emissions regulation that I cannot get around, and the Colorado's are worse. Bunch of BS. Supper happy with the truck in all other aspects, but this is annoying! I have parked the truck for the winter, don't want the tons of salt dumped on our winter roads to eat the body up, so nothing to report on cold weather conditions. Just plain frustrating!