OK, my girlfriend was trying to be helpful and added at bottle of this "STP Fuel Injector cleaner" to my '84 4ks. Oops? Does anyone know what this stuff is, or if is good/bad/indifferent for my car. It makes me nervous. I know some of those products try and re-seat rings/seals inside your engine, SPOOKY! Thanks... P.S. I've got a good "non-repair" story when I have time to type it in...