I have a Kia Picanto 2004 with 113000 km, petrol, and 1.1 engine and the engine light is on and the ODBII reader says that it is a misfire in cylinder 2 and 3. The mechanic changed the injector coil and no change. We checked the spark plugs and wires and grounding cable and they are good. I put fuel injector cleaner in and no change. If the A/C is on, the car looses some umph. What do you think it could be? I am scared to take it to the mechanic again and get charged a lot of money for them just checking stuff..