Re: Fiesta idle
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The high idle at startup is almost certainly a sensor failure but you'd need to scan for codes to know which one as several could cause the symptoms.
When the AC starts there are sensors that raise the idle speed to compensate but unless you have a slipping AC compressor belt there shouldn't be anything else related.
As noted above, timing belt will depend on which engine you have.
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Observatio Facta Rotae
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