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There could be a vacuum leak allowing air into the inlet manifold after the (ICVS) idle control valve solenoid and throttle body, or the ICVS could be clogged up and now not closing enough to bring the revs down.

or the throttle body maybe a little sticky and not closing all the way or the accelerator cable might be a little to tight not allowing the throttle body to fully close,

check all the pipes that connect to the inlet listen for hissing

check the the throttle body returns fully after the accelerator has been fully depressed and released,

alternatively it could be a sensor fault such as the maf sensor,

you could get a fault code reader from halfords to take it to a garage and get the codes (if any) read for about £20

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Q: Why does my fiesta 1.25 revs not ide down when I remove my foot from the accelerator?
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