hello i have a 1998 audi a4 petrol 118k miles drives great untill i try and put my foot down to build up speed it hesitates at around 2000rpm but then all of a sudden the powers there and its fine once it gets past it its ok on d roads and motorway once speeds built up i just have to get past the hesitation part etc if i build up speed slowly because i know about the hesitation its ok just cant get away as quick as it should pulling out of junctions etc is a nightmare ?????