Starts fine, misfire cold, then fine - ideas?

[bherlingo]

I would suggest it could be an EGR fault. I haven't studied the system that closely although I have the same engine as yours. I'll investigate a little more. We refer to EGR systems as soot collectors at work. Would you want to breath a load of secondhand dirty air? No! neither does an engine!

Thanks - Nope, can't say I would but often have to emerging from shopping centres and the likes these days! Only place the smokers seem to congregate...
Would the EGR consistently not work correctly when cold but work perfect when warm (well, thats an exaggeration - not warm but run for 3 minutes on tickover). Does it work by deflecting the airflow for a period? If so, it fits the bill..

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2 - Cold start fuelling device on the injection pump, although mine has the simple coolant operated thermostat and cable arrangement. I think 2 different types of injection pump are fitted

In case this is relevant - all this was working perfectly until the engine blew a head gasket (big time...properly cooked)- the engine was swapped but retained the fuel pump - it all started from this point.