Whats happening is water from your washer jets is leaking and running down your airbox and somehow gettin into the coil pack/leads or plugs, causing the engine to misfire, engine management light will probaly be on the dash. It can be fixed by changin the coil pack but i would recoment tryin to change the spark plugs and leads 1st.
This is a common fault with Ford Fiesta but it shouldn't happen with your year because they were realled 03/53 plates from then on the washer jets at a rubber seal on them to stop this from happning.
If it an older ford fiesta it will have a zetec s engine in it. if it newer car e.g 2005 on wards, will have a 1.388 duratec, 16v engine.
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