Gumout multi system tune up did this to my fuel injector!

Gumout multi system tune up did this to my fuel injectors. Watch to find out! Do you have a gdi or direct injection engine even a port fuel injector system with carbon issues in a previous video we also use gumout for intake valve cleaning and combustion chamber.
#seafoam #crcintakevalvecleaner

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• #carbon_buildup