Grizzman1833

Had a quick question so we recently purchased a 2009 Chevrolet suburban 5.3 Engine 4WD. So we have been having issues with it for a bit and one is that it forces itself to take off at times we have the auto on all the time which i don't see why it would effect it if when your not slipping it works in 2wd but we recently called a mechanic and they had said it was because it was in auto and not 2HI would that be an issue? I mean does that mean during the winter time when its realluy necessary that its gonna force itself to accelerate? Any feedback would be greatly appreciated.