For converting an I6, V6 or V8 engine from carburetor to throttle body fuel injection. Uses remanufactured GM throttle body appropriate for engine size. Operates GM engines with or without ECM controlled ignition. Very popular for older street-driven vehicles or 4 wheel drive vehicles. Contains all sensors, components, wiring harnesses, ECM and fuel pump to install fuel injection on your engine. Custom calibration PROM for your engine. ECM installs under dash. Fuel pump installs in main fuel line, and bypass fuel is returned to the tank. Harness includes diagnostic connector, and diagnostic is similar to 1986-92 GM pickup.