Bad Misfire Help!

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Hi there,

Can anyone help I have a 2002 Ford Fiesta 1.25 and it has a bad misfire, not too bad when driving but still there

I have changed plugs cool pack and leads

I have noticed that this rubber pipe I have photographed is always squashed in when engine is running and have no idea what it's for or where it goes. When I disconnect it from the white plastic piece I can feel air being sucked but as soon as I plug the rubber pipe back on it goes flat again as if there's too much air so I'm wondering if this is the issue? Thanks


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full edit mode, and upload a picture from your computer :)

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