2004 Ford Transit • 68,000 miles

While driving my transit 2.0 tdci today I noticed that it started to idle very high, You could see it and hear it between gear changes the revs wouldn't drop that much and when I stopped an let the revs off it was idling idling up about 12,000. When I eventually stopped and turned it off then started it again it was ok for a bit then started doing it again so I turned it off and re started it and it was ok on the way home but thats not to say it wont do it again. Has anyone got any ideas. Thank's.
October 30, 2012.

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