Lumps all cured

Thought you might be interested;

My 2.0 TDI has suffered a lumpy tickover for ages; you could feel it through the seat even if the revcounter was steady, also on the motorway I there was a hesitation when accelerating from light throttle.

A new airmass meter, fitted under warranty, has cured it, as well as some error codes being cleared. The dealer has also ordered a modified airbox and drain pipe, but why or what the difference is I'll post when the works done.