Ford Focus 1.8 cdi 2003

Had car about 3 months, but yesterday and today noticed that whilst driving at 35-40 mph in 4th gear, the car there was a momentary juddering. Anyone any ideas would it could be? Sorry to be vague, but
can't describe it any better.
Thanks
Janet Bennett
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Husband said it happened whilst he was accelerating - does this help?
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