Q:引擎光P3033圆柱3失火、换火插件、用词圈和圆柱阀

Hi

Ive had a problem with my car for a couple months now.I had the engine light come on, done a diagnostics test,i got back p303 cylinder 3 misfire.I changed the spark plugs,ignition coils and got the cylinder valves professionally changed.The car engine light still comes on whilst I am driving and then the car starts to go in lag mode where it starts to run lumpy.I turn the car off and on again and the car runs fine.However,there is a constant misfire the car is producing.There are times when the engine light comes on flashing.I turn the car off an the engine flashing light goes and then there are other times,the engine light is static, i turn the car off and on and the engine light is still there.What could this be, any suggestions please?

我的车55000里
我的车手动传输