well my first post here and sadly its seeking help.. we have an Audi 80 tdi avant its a 94 . well the problems were having is around 1800rpm were getting a stuttering you can fell through the full car. there doesnt seem to be any loss off power as if you acclerate it will pull away smothly. now heres the most worrying problem.. this has only happened a few times but around town at slow speeds the brake pedal will go rock solid as if the servo has stopped working.. now im hoping to get this sorted out so if any one has an idea please fell free.