About three years ago, I bought a case of Techron fuel system cleaner from Sam's Club. I never used it and it was kept under one of my workbenches. The other day I found the box and decided to put one bottle of it in the tank. Couple of days later I noticed that the car seems to be running better. The acceleration has improved and the engine more responsive. It felt good as if I was driving a new car. I guess with all the years that I have been driving the car, performance has degraded little by little.The cleaner probably cleaned up the injectors to the point that it sprays like new again.