A few weeks ago, I was driving along the motorway and noticed although I was putting my foot down, the car was not accelerating as it should. Eventually when I got off the motorway, and tried to accelerate having stopped at traffic lights, the car was not picking up speed. I pulled over, put the car in neutral and put my foot down and the rev counter responded accordingly. To cut a long story short, the garage replaced the Diesel Particulate filter. The cars been fine a for a couple of weeks, but now the same symptoms have reappeared. Has anyone had this issue, if so what was the resolution?