Hi, ive got a 1.6 fiesta si and its fine to drive up until when it warms up to temperature when it starts to misfire under load

this is the 3rd zetec si ive had to do this

Anyone know what the problem is?

possibly HT leads breaking down?

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Will

have you tried new plugs and leads?

as said plugs and leads are usally the cause for this

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Audi A4 Cabriolet 2.5TDI 163 Sport
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zetecs love to eat ht leads

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Rip Ben Elvin (jam)

thanks for the replies ill change the plugs and leads and let you know.

try if you can to get genuine ford plugs and leads, i found mine run alot better ans smoother

i did have some random plugs and leads on and found it never really ran right for some odd reason

cheers mate will do

serviced the car today including plugs and leads and its sorted the misfire, thanks for the info.