Renault Clio 1.2 2001

Hi,

My clio has developed a new problem where I can drive it fine for around 20 minutes and then it just turns off with and won't start again for up to 24 hours. The engine still turns over, but it just won't start. Occasionally there is a sign that it is about to happen that when you change gear the car judders and the engine light comes on before it just cuts off. I have quite literally no idea what is causing the problem, does anyone have any idea?

Thanks.