black smoke grey smoke help

Hi Guys and Girls, need some help please. I have a 56 plate TD4 in the last 6 weeks its had 10 new injectors fitted because the electrics in the top keep shorting. Its also had a new fuel pump and filter,an injector pump (new) was also fitted after it refused to start and low fuel pressure was diagnosed. I've had it back a week or so and its started to smoke again I suspect another injector has the same problem has anyone had the same problem and if so how did you cure it? Getting desperate now!!!

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