Last night driving back home from work all of the sudden it started pouring, i mean pouring rain, i could not see 10 feet in front, i had to stop for a while until the rain calmed down, the road was flooded in several places so deep i could actually feel the car splutter when i drove through them, well the result, it now runs smoother than it ever has , i guess it must have drank enough water to steam clean away the carbon.