OTC 7649 Fuel Injector Cleaning Kit Clogged fuel injectors cause sluggish engine performance poor fuel economy and a rough idle You can easily correct such problems with this injector cleaning kit. It works on a wide range of engines both domestic and imported Using the Pro Inject-R Kleen fluid you can effectively clean injectors restore their spray patterns and prevent recurring deposits The kit also enables you to do low- and high-pressure fuel system tests. It will also work with your shop's pressurized air supply for more powerful cleaning without expensive propellants Removes carbon from intake and combustion systems when used with fitting number 7666 and number 7904A D-Karbonizer4 fluid