Mate, I have the exact problem on start up in my td5. Idle Revs are fine, intermittently though, when accelerator is pressed revs are laboured as if fuel isn't combusting and then it blows smoke. Hold the pedal down or give it a few pumps and the revs catch up and then it drives like a dream.
- cleaned red ECU plug (seemed to help) but gone back again
- MAF, MAP and sensor after the EGR cleaned. Ran better but still start up issue sometims.
- got harness to do so I'll check inside my rocker
- fuel pump is fine and I've done full B service on it
Feel like my oil may be creeping up too but can't work out if I'm imagining it
Have you found the issue??
