Over-revving and under-revving Focus

[andybillo]

Hoping soneone out there can help with some advice for my 2000 1.8 petrol Focus. It has started to nuder-rev when idling, and occasionally cutting out what stopped at junctions if I dont keep the revs up above 1000, it does over-rev at times, but then it drops to below 1000. I have heard that this may be as a result of a faulty idle control valve.

Does anyone have any other ideas as to what it could be? and what the potential costs could be

Cheers

[andybillo]

Great, thanks. will give it a go.