D5 stutter

The engine seems to stutter (but still pulls) under hard acceleration. Like the sort of misfire you get when an ignition coil goes out on a petrol engine. Does the D5 have similar ignition coils per cylinder? Faulty injector maybe ? But starts without problems, fine when cruising and with moderate acceleration. Car's done 96K , just had major cambelt service a week ago and engine was sweet as peach for first 250miles after the service. What could it be?

Take it back, let them sort it out, you paid good money.

Did we ever find out what caused this? :-)