My Td4 was starting OK just, but laboured start, some smoke, and very lumpy on tick-over and for first 100- 200 metres, after that was fine.

I used a bottle of Millers Injector cleaner (whole bottle in about 45 litres of Diesel) after 200 miles Transformed!! I was sceptical to begin with, but now instant clean smooth starting, am won over on the product