Hey I have a 1.1 Cinq Sporting. At the moment I am mis firing on a Cylinder. I have tried everything to stop it, replaced the spark leads, and fed the engine fuel injector cleaner. However the cylinder still mis-fires. A friend told me that it could be the spark plugs. When I switch the engine on a light on the dashboard that looks like a spark plug lights up for about three seconds and goes off after all the other display lights? Does this mean the car needs new spark plugs as i do not have the car's manual, and would this be the mis-firing problem? Please HELP!!!!!