Probably find its somethin to do with the injectors. I would try and clean the injectors. If you remove the fuel filter (which should be attached to the bulk head) and replace it with a new 1 but before putting the new one on buy some Diesel Injector Cleaner should be around £7 for a bottle. tip this Injector Cleaner directly into the fuel filter and screw it on to the carrier. If you have a diesel primer, manually prime the filter until it gets really hard to push/squeeze. You then know the filter is full. Start the engine and let it run for 2 to 3 mins if it cuts out prime it some more (should be soft again). Once you've done that it should tick over okay. Now you need to give you car a blast up the nearest National speed limit road there is to force the cleaner through which might smoke a little to start with but once you've done that for 5 mins or so, you should be Missfire free providing it is the injectors and if it still missfires the chances are it could be a faulty injector valve which would require a replacement of all injectors. Hope this helps
Spark plugs or Coil pack most likely
Usually the occasional spark plug that needs to be cleaned and gapped.
What causes misfire 302, 304 and 306
A Female Driver...
Misfire detection.
the gun powder ispacked to tightly and the preassure builds up and can cause it to misfire
In general (very loosely) a misfire can be a bad plug, wire or coil.
Time to replace seals, this usually causes misfire.
Normally a vacuum leak.
A misfire will cause flames to come out of the carburettor
Spark plugs
Driving to fast