[Silverback51]

Another one of the great misconceptions of Horse Power.

More fuel, or running rich does not increase your HP. Without more oxygen it will not burn, and in reality reduces HP.

Another mistake that is commonly made is running higher octane gas. Octane by itself does not increase your HP. Octane only allows you to increase cylinder pressures, or advance the timing so you get more power from those changes.

And I have to agree with everyone else, buy new plugs.