I just bought my first GMC (always had Chevys) before, I have a 2013 Terrain SLT with a 3.6l engine after buying a few bolt ons, it where I want it to be very nice, smooth riding truck, I just have one problem, don't know if it's a trait or not. When I floor it, it picks up like mad, but as it's almost at the peak RPM's the truck will swerves back & forth in the lane, very very scary, this happen to anyone else?