Hi folks - any help appreciated. I have a 56 plate 170ps TDI Quattro and somehting is happening to it. When it is cold - if i accelerate it will feel like it is cutting out for about half a second as it revs up then gets back to normal. Over the last two weeks i have now noticed that if it is hot the car sometimes seem to feel like the turbo is not working and the exhaust sounds like a low grumble. When sitting at lights the car seems to shudder coming from the engine. Not sure what is happening. Any thoughts???