My WS 1.6 is smooth down to 1500 rpm in 5th - about 50 km/h - although acceleration from there is slow. By the way, what fuel are you using?
I'm not an automechanic, but I could imagine several possibilities such as ignition timing off or fuel injectors need cleaning. Is it idling rough as well? Best to get it checked.
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"Look at that! The smoke grenades fit perfectly in the cup holders."
"I've got 120 horse power in this. You don't want any more than that on marble."
- Jeremy Clarkson on the WS Fiesta Zetec
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