Q: 4th Cylinder misfire when start the engine

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The SES(Service Engine Soon) indicator of my car will be lighted when I START the engine, and some days later it will gone. Not sure why, but as of now I have had the same issue multiple times, light is on when start engine and then off after some days. I bought a diagnosis tool, every time I got SES, I used the tool to read the error code and it told me "4th Cylinder misfire", I have NEVER had the same issue when I actually drive the car, it just happens every time when I start the engine. I already replaced with new spark ignition as well as Ignition Coil, but still have the problem. Any comments here will be appreciated! Thanks!

My car has 90000 miles.
My car has an automatic transmission.

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