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Drich290195

Fiesta 03 lumpy acceleration

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I have a 03 Fiesta. When I accelerate hard it really does judder sort of really lumpy. It's fine if I accelerate slow but does not like anything fast very juddery. It's a 1.4 petrol any ideas. Thanks 

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difficult to say. I think spark plugs could cause this if they were in a really bad state.

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1 hour ago, Drich290195 said:

I have a 03 Fiesta. When I accelerate hard it really does judder sort of really lumpy. It's fine if I accelerate slow but does not like anything fast very juddery. It's a 1.4 petrol any ideas. Thanks 

Check the resistance of your plug leads, one or more could be 'duff'. --- https://www.ngk.de/en/technology-in-detail/ignition-cables/diagnosis/testing-of-ignition-cables/

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