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Mk4 1.25 Zetec 'Hunting' When Idling

DesLav
DesLav
in Ford Fiesta Club

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Hi. I have a 59,000 mile 1.25 Zetec Fiesta Chicane that is generally well behaved but, recently, has started 'hunting' when idling - the revs drop to about 500 then climb again to around 950, that sort of thing.  I'm sure I've heard of this being something to do with an air-control valve, or the like but would really appreciate chapter and verse on what to do, i.e. what needs doing, where to access whatever it is and the best recommended method to do it!  Not much really :)

Many thanks, Des.

P.S. Pictures would be good if at all possible too (I need all the help I can get).  Oh, any pitfalls to avoid would be great as well.

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    It on ln let manifold remove an clean with carb cleaner


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