Lurching 40 to 50 mph slight hill

[Dave LV]

So at least it isn't a universal design fault, I hope, based on your experience. Negates GM's "it is normal".

Just wondering, what temperatures were you all driving in? Here in Las Vegas, I kinda wonder if it started in March when the temperature warmed up, and when I was in Colorado it was cooler and not so noticeable.