Kit contains the most complete, single-use gasoline fuel system cleaning and maintenance program for professional tune-up service providers without the need for expensive, complicated equipment. Formulated with H.E.S.T. And powerful detergents to maximize cleaning. Easy-to-use kit contains: step 1 air-intake cleaner (aerosol)- to improve idle and throttle response, step 2 combustion chamber cleaner with installation tools to thoroughly clean intake ports, valves, combustion chambers and step 3 fuel system cleaner- to clean All types of fuel injectors or carburetors, fuel pump and fuel lines. Includes instructional DVD.