I never quite understood the concept of stalling a manual car. According to my google searches, a stall can be caused "by not timing the release of the clutch and pressing the gas pedal correctly. You need to give it just enough gas not to stall it while slowly releasing on the clutch so you take off smooth and without damaging your car". What I don't understand is why timing the release of the clutch matters to the engine. Isn't the rotational motion of the pistons inside the engine enough the sustain the constant motion to keep the engine running? Why does the timing of the release of the clutch matter? Also, what does pressing the gas pedal have to do with this process. Thanks guys.