Smokes very badly (white diesel smoke), seems to strugle then suddenly come on boost and shoot off (not the normal turbo lag).

When cold runs on three and needs to be cleared out, when warm drives a lot lot better almost hard to notice a problem and only smokes a tiny bit.

Has had previously by others

Cylinder head,
Injectors, and ive tried others
EGR
Fuel filter.

Need to diagnose this, dont want to take it to Ford becuause thuey are the ones who incorrectly fitted the head, spoke to an injection specialist who basically scratched his head!

Only thing left really is a fuel pump but ive onluy ever heard of these causing fuel starvation (stalling) and not what im guessing is the problem of over fuelling.

Any help greatfully appreciated