[Younels]

Hi, I have a 2016 420d m sport auto coupe. Over the past week it has developed what can best be described as intermittent juddering when travelling at approx 35-40 mph and approx 1500rpm. The car is fine under acceleration.
The juddering happens both in normal drive mode and sports mode. I thought it may have been egr valve but can’t see why it only happens at this speed.
Anyone experience similar issue or know what problem could be?
I can’t get it booked in with my local Bmw dealer for a couple of weeks!