I had this with my 206 Hdi, with some trepidation I put a bottle of injector cleaner in. The result was amazing, the missfire dissapeared in just a few miles and the car now runs better than ever I can remember it from new! Some one on this group had reservations about using injector cleaner on a common rail engine but by then I had done it. I have now done another two or three thousand miles and it is as sweet as a nut. B