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Hi need help with fiesta mk6 1.3 o3 plate sits idling fine but then will star revving up to 4000 revs on its own the moment you start driveing it's had two new throttle body all pipes are fine just don't know wot else to do and its to dangerous to drive now 

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Try MAF sensor cleaning or running the car with it unplugged.

Are you on an electric throttle body or cable driven?

The cable ones have a separate Idle Control Valve which gets stuck part way open and causes rough idle. Never mind you said idle was fine...


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