It seems that the running power is getting weaker and weaker.

The number of car kilometers has reached tens of thousands of kilometers. If it is not gasoline, there may be more carbon deposits in various places, so there is no motivation. I washed the throttle first, and then changed the spark plug. Not yet. Burn two boxes of oil with fuel additives on the hour. Burn one or two boxes of oil and three-way catalyst cleaning agent and put them in the oil tank.