Originally Posted by OrangeFurious

FWIW, both my 4.4 and 4.8is have done this regularly in the time I've owned them. It's annoying as hell and occasionally feels like being rear-ended. I had the 4.4 pretty heavily investigated by an indie shop (Signature in Kirkland WA) and they couldn't find anything "wrong" with it. Adjusting my throttle technique eliminated the issue.