Hi, I have Opel Frontera 2.4i petrol engine, registered in 1993. It uses to light check engine indicator from time to time. As I observed it happens often when there is little fuel left. Also it can't accelerate over 60 km/h and drops to this speed. My first decision was that it was do to little fuel left, but it lights on also when there is much fuel. thank you in advance for your help