Went to Interstate Ford dealership in Miamisburg, Ohio and they could not find the problem. They think I am crazy. The problem only happens on occasion, not all the time. The clunking sound and jerk can be felt when turning corners or upon acceleration. It is most annoying and of course does not happen with a mechanic in the car. Both my wife and myself have driven the car and we have both felt it at times. Would like to get the problem corrected before warranty is over.