* Throttle Cable or Linkage Issues: A sticky or damaged throttle cable could be sticking open, causing unintended acceleration. Similarly, problems with the linkage connecting the gas pedal to the throttle body could be the culprit. This is one of the more common and relatively easier-to-fix causes.
* Throttle Position Sensor (TPS): This sensor tells the computer the position of the throttle. A faulty TPS could send incorrect signals, leading to the engine receiving commands to accelerate when it shouldn't. This is a relatively common sensor failure.
* Mass Airflow Sensor (MAF) Sensor: This sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor can cause the computer to miscalculate the fuel mixture, resulting in unexpected acceleration or other drivability issues.
* Computer (PCM/ECM) Problem: The Powertrain Control Module (PCM) or Engine Control Module (ECM) is the "brain" of the vehicle. A malfunctioning computer can cause erratic behavior, including unintended acceleration. This is a more serious and expensive potential problem.
* Vacuum Leaks: Vacuum lines control various engine functions. A leak in the vacuum system can cause erratic idle and potentially unintended acceleration.
* Cruise Control Malfunction: A faulty cruise control system, especially if it's stuck "on," can cause the vehicle to accelerate unexpectedly.
* Transmission Issues (Less Likely): While less probable, a severe problem within the transmission itself could theoretically contribute to unwanted acceleration, though this is usually manifested differently (like sudden lurching).
Crucially: Do not attempt to drive the vehicle if it's accelerating on its own unpredictably. This is extremely dangerous. Have it towed to a trusted mechanic for diagnosis and repair. Ignoring this could lead to a serious accident.
