Everyone here is making the assumption that car engines are built with the precision of a Swiss watch…They are not…Your engine, for whatever reason, could have it’s compression at the upper limit or the ignition timing control/knock sensor is a little out of whack. Changing the knock sensor MIGHT help, or simply changing BRANDS of gasoline (try a “top tier” brand like Shell or Conoco/Phillips) might cure the problem and save you some money. I disagree with the EGR reference. That valve is closed and not in the picture during any acceleration period…A rip to the dealer to check the timing and knock sensor might be in order…