ACDelco 10-3004 Fuel System Treatment - 12 oz Removes deposits from port fuel injectors to keep injectors functioning properly, ensuring unrestricted fuel flow Cleans intake valve deposits to help eliminate starting issues and ensure maximum drivability Cleans combustion chambers to assist in eliminating engine knocking, pinging, and run-on in older vehicles, and loss of power and acceleration in knock-sensor equipped vehicles Coats all metallic surfaces, protecting the entire fuel system