When you are braking, the wheels are still spinning. When you are off the accelerator the engine goes into overrun and actually help the brakes as the engine provides negative torque to the driveshaft.
If you come to a stop, some form of clutch, whether operated by the driver in a manual. Or automatically in an automatic, will open up and decouple the engine from the wheels. The engine at this point will fuel again and idle.
If you were to press both the accelerator and brakes. And were somehow able to keep the clutch engaged, in a manual for example. If the wheels don’t spin, the torque from the brakes is too strong and the engine will stall.
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