Hi i have a mk7 fiesta i had a problem in the rain and it spluttered as well it was due to water leaking from tge washer jets on to the spark plug which made them crap took it back to ford and they sorted they said it happens alot on the focus aswel
Sorry to bring up an old thread, recently the hunting became regular, every time I was sat still the whole car would shudder and when I tried to drive slowly through traffic it would constantly (and uncomfortably) affect the speed. Today me and my dad took out the spark plugs and gave them a good clean, and now it sits perfectly at idle, and only occasionally, and gently shudders, This might be normal, but it's been a massive improvement. Thanks to everyone who suggested the above causes, it could of been any of them really!
i had the same problem with my zs i took it to my mates garage and he said due to the crap design of the water pipe or somthing due to the water jets on the point somtimes they leak water on to the spark plugs what cause the shakes as it leads to a miss fire he said he had a fair few focus doing the same we changed the spark plugs and put a new water pipe on never had the problem since
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