What could be wrong with my car?

Ok, so I drive an old 1996 Vauxhall Corsa. Sometimes, like today, the engine seems to keep losing power. I can be driving along and it'll suddenly just start slowing down and start juddering. When it's bad, my car actually just dies everytime I try to pull away. Often it's absolutely fine but it's... show more Ok, so I drive an old 1996 Vauxhall Corsa. Sometimes, like today, the engine seems to keep losing power. I can be driving along and it'll suddenly just start slowing down and start juddering. When it's bad, my car actually just dies everytime I try to pull away. Often it's absolutely fine but it's scary when your car just dies on a budy junction and there's nothing you can do about it.
Does anyone know what the problem could be?
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