Hi. I've got ford street ka on 55 plates. I've bought it few months ago. First the engine lights started to come of and off. It was showing cylinder 1 misfire. I had all the plugs and coils replaced. It was better for few weeks and now the engine light came on after feeling shaking on the steering wheel and today the rpm needle wasn't going down straight away but after 2-3 seconds. Then it wasn't going down completely and was stuck in about 1.5 when I was stopping on the lights. I've stopped the car and rev it to about 4 and then it was better but engine light is still on. What can it be?
Possible air leak into the intake manifold