The head tech who works on my car allowed me to view the process of injection cleaners. He basically pulled vacuum lines from the Throttle body and sprayed it into the lines. Doing this sent the car into a near stall, he would spray as or as much so the car would maintain running. We did a diagniostic before and after and the sine wave reading was cleaner after. Pretty basic stuff considering some people use crazy machines and hook ups. He said that what he was doing was a spec injector cleaning and he did it for free.... cool. My end point here is that I believe any one of you could do this yourselves. Maybe Joe_Black or Tone could chime in onto what lines to do this. Some might think this is lame maybe but my car runs really well.