Vehicle engine control

When a setting state has occurred during a coasting, increased throttle opening, as a locking unit for a high speed stage, and an engaging unit for a low speed stage are disengaged both, which can cause over-rotation of the engine and an associated engagement shock. A difference between the engine speed and the turbine speed is detected and recorded during a coasting. The difference represents an absolute engine output on the basis of the vehicle load. In the on state, an adjustment amount, which is determined on the basis of the difference, is added a required basic throttle opening, to obtain a throttle opening which allows the difference is maintained, and at which the engine speed and the turbine speed can be increased.