Car shuts off when stepping on gas pedal Inspection
Engine dying or stalling immediately when pressing the gas pedal? A stepping-on-gas stalling inspection diagnoses severe vacuum leaks, failed MAF sensors, weak fuel pumps, and clogged throttle bodies.Pressing the accelerator opens the throttle plate, instantly drawing a large volume of air into the engine; the engine control module (PCM) must immediately match this sudden air charge with a proportional pulse of fuel and ignition spark advance. If the air-fuel mixture leans out excessively during this transition, combustion fails instantly and the engine dies.