Thanks Chris. Could be the Lambda playing up again. The injection light did come on for a couple of seconds the other day, but no driveability problems yet. What disturbs me is that this Lambda sensor is about 14 months and 13000 km old, plus it is the uprated one.
What I also noticed is that the revs fall slowly to idle speed after decelerating.
There are no air leaks, my mechanics checked that when they replaced the EGR valve last week.
I assume idle speed is not adjustable on this model?