Hi all.
I have a ford fiesta 1.25 zetec that has suddenly developed a misfire on number 3 cylinder. I have checked the plugs and all ok, I have replaced the leads and coil pack but has made no difference at all. When I looked at the plugs they were all the correct biscuity colour apart from number 3 which was black, sooty and dry. Any advice on what could be wrong will be greatly appreciated. Thanks.
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