Hi! I have a 1.4 Astra 1997. Recently bought it. It’s very clean. But the engine management light comes on often, I’ve noticed it comes on more if I have to put E10 in😖 also it’s missing and it loses power..but that can happen even with E5. Today the oil light has started flickering 😭 checked the oil but there plenty in it, I did too up just in case..still light comes on. Any ideas please