Why does car take off without pushing gas pedal?

A car may take off without pushing the gas pedal if it is in gear and on a slope, allowing gravity to move it forward. Additionally, if the engine is running at a high RPM or if there's a malfunction in the throttle system, the car could accelerate unintentionally. Another possibility is that the vehicle is equipped with an automatic transmission feature like "creep" mode, where the car moves slowly when in drive without pressing the gas.