In the G8 with Solo axlebacks, I used a bottle of RXP gas kicker which not only cleans the injectors, but also cleans the exhaust, oxygen sensors, and a whole bunch of other stuff. If you use it on a relatively old vehicle, it may throw a code as all of the carbon deposits are being pushed pass the oxygen sensors and the car may have some initial hesitation. Put a bottle in the tank. Fill the tank up. Run it through. You SHOULD notice a difference. It's call RXP gas kicker in a small yellow bottle. While you're at it, you might want to go ahead and clean the throttle body as well, and for that I recommend a can of B12 chemtool. GL!!!
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