If it was that simple don't you think everyone would already be doing it? Could be your injectors were just so clogged up that you are now returning to "normal." Had the injectors cleaned at the dealership recently for 60K service and felt similar results and saw all of the black smoke come out of the car when they did it. Then put in the new plugs and the rest of the 60K service. Made a big difference in idle smoothness and power.