What would cause the lose of power when hot. Had a new turbo and cylinder head and new injectors but when hot it loses power and smokes. When cold it goes ok as long as under 2000 revs.

on?

What year/series truck Steve ... very hard for us to help with limited info , there is a big difference between K74/series 3 / classic ( 1998 up to 2007 , pre fly by wire , physical accelerator cable up to approx 2002 , fly by wire ( FBW ) approx 2002 onwards ) ) than the B40 / series 4 / pram ( 2006 up to 2016 )

Sorry about...that its 2003 2.5 Steve.

id re check the pump timing and the pump pre lift first off

whats it boosting at?

Hi Not sure what boosting at? And the pump has been renewed.
I would like to say that this is being so say sorted at a garage
but beginning to lose confidence, so thought might be an idea to ask other folk.
Not really mechanically minded.