Hi...

I own a 93 E320 W124 Merc.

This happened to me three times on distant occasions. While I on the highway (approx. 120 kph) the engine suddenly slows down and starts to vibrate mildly (vibrations more visible at lower speeds), and the acceleration dies making the car take ages to increase its speed. I noticed that this would happen when I drop my speed then try to raise it up again (ex. 120 to 80 then climbing back to 120 at a normal rate). Again this happened only 3 times over the last year so I really do not know what exactly triggers it.

Any help is greatly appreciated.

Thanks