The engine has started juddering occasionally. This phenomenon appears when engine has warmed up to normal temperature, but never when engine is cold. Shock is very strong and brief. I have scanned engine fault codes and there is not any fault codes. Then I logged into the engine controllers measuring block in channels 15 and 16 and found that cyl1/cyl5 has misfire status between 0,6...6,5 ms while the rest of cylinders has misfire status 0.

Please tell me what does this mean?