If you do short journeys any diesel will benefit from a good run. Hold a lower gear at 3000 revs for a few miles with the engine under load, that should get rid of any build up. Then again it could be the EGR that's causing the problem. Can you feel the turbo spool up and does the engine rev OK? A lack of boost could be caused by split tubes to the boost solenoid / turbo. Are you sure the turbo hoses are OK, if one is split you may be able to hear a whistling sound as the air escapes.
Brilliant Blue 156 GTA SportWagon
2011 Ghiaccio Bianco 159 2.0 ltr JTDm Lusso SportWagon