Truck run well and feels like it has plenty of power/torque when unloaded. As soon as I hook up my 8000lb travel trailer she pulls good until I hit 45mph or greater. I have no gauges on this stock truck but when I reach this speed or try for more I can no longer hear the turbo whine and she start to sputter as if it's miss firing like on a gasser. Only happens at 45mph or greater though. Any thoughts. Thanks