Hello, my c3 began violently juddering today whilst i drove up a hill. thinking it was out of petrol i got my dad to bring me some more (it had approx 40 miles in the reserve tank). i then drove it home and to begin with the juddering wasn't as violent and did go off for a few minutes. however, at some traffic lights the car lost all power - it was easily restarted but this happened twice. as i carried on driving home the juddering varied from being extremly violent to not so bad - it finally lost power again when i pulled in my drive way. its not the clutch - i've already experienced that on this car and this juddering was a completely different feeling! it was almost as if the car had something blocking somewhere in its engine - like it was trying to throw up?! help please! ideally need it fixed asap!