we have a 2007 1.9cdti 150 estate (82,000 miles) which is driving us mad! Hard to describe problem, the engine is lumpy (my husband says if it had plugs it feels as though 1 of them needs cleaning).
we have looked on the forum and tried all the things below and we still have the same problem.
checked swirl valves (now glued them open)
Cleaned EGR and throttle body
replaced 3rd injector wiring
used a de-coker
my husband is about to give up and take it into our local garage, any further advice form anyone would be great.