Fiesta Starting Mystery

Have a 1992 Ford Fieasta 1.4. Something is causing it to refuse to start from cold. Garage have checked all the usual and can find nothing wrong. For some reason there is no spark on turning the ignition. Once it HAS started
however it starts fine....until the next morning. Is there any known fault which might cause this? They even fitted a "Cold Start Switch" to the carb but this had still not worked.
???
Thanks
JP.
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i have a ford carb engine and i just press the accelerator once b4 i turn the key and starts straight up

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