odds are it will be a faulty glow plug.
Mine had one plug faulty- started up fine, depending on outside temperature, it would either started with the glow plug fault light flashing on the dash until i switched off the engine, upon a re started the light would disappear for the rest
of the day ir no light sone days.
As mentioned, use a code reader to tell you which and get some penetrating oil around that plug a good few days before attempting to remove it!!,
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