If you need your injectors cleaned and blue printed, there is a shop in Torrance called RC engineering. I have used them for many years and they do really good work. It would cost @ $250.00 to do all 6 injectors. Best part they will supply you a rating of a before and after cleaning. Also have you replaced your spark plugs again, or maybe take your plug wires out one by one at a dark place and see if they are sparking or not?