I am experiencing sporadic loss of power with my 2003 E270 Cdi. Occassionally after starting up I cannot increase speed above 40 mph. I f I stop, switch off and restart all returns to normal. I have been told that this was a common fault with this model and have heard horrific stories of failure by Mecedes dealers to sort the problem. I bought the car 2 months ago so i am still covered by warranty. Any info would be appreciated.