What is the tps on the side of the tbi and what is a tbi in a car?

TBI stands for Throttle Body Injection, a type of fuel injection system in cars where fuel is injected directly into the throttle body, mixing with air before entering the engine's combustion chamber. The "TPS" refers to the Throttle Position Sensor, which monitors the position of the throttle plate and sends this information to the engine control unit (ECU) to optimize fuel delivery and engine performance. TBI systems are simpler than multi-port fuel injection systems and were commonly used in vehicles from the 1980s to the early 1990s.