A throttle body is what is responsible for regulating the amount of air your engine takes in. On a fuel injected engines, the throttle body replaces the carburater. If you look at your air box and follow the round plastic tube back to your engine, thats your throttle body. You should see the throttle cable connected to it, which moves when you press the gas.
1995.5 Isuzu Rodeo - SAS'd and SOA'd, sitting on 36x12.50 TSLs, D44 front, 14bff rear, locked by OX and Detriot, suspensions by Jeep and Chevy, high steer conversion, 5.13 gearing and Teralow in the case.