Over time, carbon, varnish, and gum can naturally build up on a vehicle’s throttle body and throttle body bores. This can lead to an assortment of engine issues, including a loss in fuel economy, rough idling, stalling, or a glowing check engine light. CRC Throttle Body & Air-Intake Cleaner is the top choice for cleaning throttle body build-up. Safe for use in all fuel-injection system gasoline engines, whether throttle body, multi-port, or GDI, CRC Throttle Body & Air-Intake Cleaner is quick and easy to use, delivering easier starts and smoother performance.