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fiesta1.4 tdci 2006 surging?

i have a 1.4 tdci fiesta, when throttle is steady at any speed, engine surges and smoke from exhaust.
under pulling, exceleration smoothe and no signs of smoke.
any ideas please
steve, December 2012
fuel filter may need changing

GHOST, December 2012
link Click here to see other fixes for Fiesta.