Help please guys, trying to diagnose this one from a distance at the moment (havnt seen the car) but from what ive been told

1999 focus 1.8 TD Di Smokes when cold and runs rough ish (prob on three) but seems to clear when warm (not fully)
Has had -
Head , injectors, egr, filter !

Would a coolant temp sensor affect fueling drastically on this engine?

Any ideas?

Thanks in advance.