Mazda Star 1.6 automatically shifts gears. What's the matter with high revolutions in the later period?

From the professional principle, the higher the throttle opening, the higher the speed;

2.

The throttle of gasoline engine controls the throttle opening instead of the fuel injection quantity;

3.

That is, the opening is small, the air mixing in the cylinder is small, and the power generated by the engine is small, and vice versa;