Hi all I have a 2004 A3 TDi 140. Had a new turbo put on it last week. Everything seemed fine for the first week, but then it developed a stuttering under hard acceleration. It is fine up to 3,000 rpm but then it stutters and coughs and loses and gains power. What do you think this could be? I ahve posted a simlar question in the A3 8P section, but was hoping for some diesel expert advice. Cheers A!