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fiesta idle problem?

my fiesta p reg, has an intermittent low idle problem, at times its fine but at others its revs hunt from around 500 to 250 revs until after about 1 minute it stalls.
I've replaced plugs and leads, and has also had a new low idle sensor (2 yrs ago)? Any ideas??
dave, January 2009
sounds like the idle control valve is sticking and needs cleaning out, another part which may need a clean is the throttle body housing

david, January 2009
link Click here to see other fixes for Fiesta.