The car in question is a 1.9JTD.

After driving on the motorway for approx. 20mins or so i tend to loss some power (i.e. get stuck behind a slow car but am unable to gather enough speed to overtake until revs reach over 3000).

Originally i thought that it was after heavy breaking as i only noticed it when pulling away at traffic lights/roundabouts at the end of slip roads but it is now noticable when actually driving.

Any ideas anyone? I have to drive to Devon at the end of May and could do with fixing this problem (or i will have to borrow my dads Rover!).

Thanks in advance

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Fiat Bravo 1.9JTD Broom Yellow!