Anyone ever heard of this stuff called seafoam that you put a 1/3 of it in your gas tank, a 1/3 in your intake, and a 1/3 in the intake manifold and then run your car for 10 minutes ? Apparently it's suposed to clean out all the black carbon and shit from your motor and your tank and then you're supposed to change your oil and spark plugs after doing it ? I saw this stuff at a local car shop and was wondering if anyone has experince with it. I've only heard of a couple kids who have done it and they've aid they felt some power increases. What do you guys think ?