My Vauxhall corsa montana has started making off noises and shuddering randomly when it's driven. It's recently developed a problem where the full beams randomly come on and the oil light is constantly illuminated. It stalled and refused to start for a few moments and then decided it was going to shudder a lot. It had new oil later that day and it's still shuddering. The oil level was fine but changed it anyway and I have no idea what's causing this issue. Any ideas?