What is a TPS on Chevy Lumina?

TPS on a Chevy Lumina refers to the Throttle Position Sensor. This sensor is a crucial part of the engine's electronic control system. It monitors the amount the throttle plate is opened and sends that information to the engine control module (ECM) which then adjusts fuel and ignition timing accordingly. A malfunctioning TPS can lead to drivability issues, poor fuel economy, and even prevent the engine from starting.