is there a spark? if not it could be the engine management chip, im not 100% sure if the zetec use's one but on my old 1.1 cfi engine it had a 'engine management chip' that was located onto of the main fuse box, its a little relay. my car kept cutting out and then running again like there was very little fuel getting to the carb but then driveing to brighton it died compleatly and what had happend is that the relay had burn out and was stuck on open which ment all the engine electrics wouldnt work, took the garage 3 days to find the bugger
but if your does have it take the fuse box out and its with the relays on the top, green relay with engine management written on it

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Audi A4 Cabriolet 2.5TDI 163 Sport
Full Interior Lighting Pack - Puddle Lights, Footwell Lights, Door Markers, Handle Ambient Lights, Air Vent Illumination, Armrest Illumination, Roof Ambient Lights. Auto Dim Rear View Mirror, Cruise Control, Full DIS, Genuine 6 Disc CD Changer in Glovebox, RNSE, Remote Windows, Parrot Bluetooth, Storage Pack, Full Leather, Heated Mirrors