This 12 oz MAG 1 fuel injector and carburetor cleaner is designed to remove stubborn deposits from fuel injectors, throttle bodies and carburetor passages. The aerosol formulation helps penetrate and dissolve varnish, gum and carbon that accumulate over time, which can lead to rough idle, hesitation and poor fuel economy. Typically used during routine maintenance or troubleshooting, it should be applied according to label instructions and safety precautions. Not a replacement for professional mechanical service when major repairs are required.