There used to be (and may still be) a nationwide company called *maybe* Precision Tuning, or something like that, so don't hold me to that name. So I went in when my Pontiac 6000 STE went out of warranty for the special $19.99 tune, or something like that. I had to put down the money, because they did not trust their customers, and was not going to get it back, if I refused the work./ And what was the work? It seemed that my almost new car needed a fuel injector flush which was about fifty to seventy dollars *before* they could even get to the $19.99 special. I left, leaving the money on the table, and wrote a letter explaining small claims court which would get my money back and they would have to pay court costs. I received a check within the week. I have owned a dozen or so cars, from BMWs, Jaguars, Fiats, Pontiacs, Jeeps, Hondas, etc. And I have never had a fuel injector flush. The champion was a Jeep dealer who explained that *their* 60K service involved changing all the fluids. for only $600.00. I asked if I got a blood transfusion with that. Then I asked for my car, which they took fifteen minutes to find. They lost their Jeep franchise, but still hawk GM.