Hi I came across these threads, and I am encountering a similar juddering problem, however mine only happens at low revs, i.e sub 2k revs. It sumtimes on rare occasions it stutters at 4.5k but very slight. I only seem to come across threads that talk about higher end problems. Iv had a friend plug in an OBD 2 machine but doesn't seem to find any faults. Any ideas what the problem may be?