HDi Misfire Problem

[DHallworth]

When i start my HDi from cold it misses for around 3 - 5 seconds.

Once this has passed it runs fine all day, but sounds horrid when it starts.

When the engine is cold and just started it shakes through the car, so i am pretty sure its missing on at least one cylinder.

I have been offered a set of injectors cheap, but the numbers on the caps are different, so i might just swap the electrical gubbins on the top of them round like i did on my brothers.

Any suggestions guys?

Regards

David.