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The best thing to do is to remove them and bring them to someone that has a machine that they can hook them up to.
As far as I can tell (someone correct me if I am wrong), the cleaners that are made to be put into the gas tank are "snake oil."
There is also an injector cleaner that you connect to compressed air, hook up to the fuel rail, run a hose to the throttle body and block off the fuel return line so that the engine is running on the cleaner...only the cleaner and it works well. It is made by a company called BG. Chrysler/Dodge/Jeep dealerships use it...maybe other places do to. It forces the cleaner through the injectors via the fuel rail, it sprays another cleaner through the throttle body and it also comes with a gas additive. In my oppinion this is the next best thing to removing the injectors for cleaning and flow testing.
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