I seafoamed through the brake booster and the vaccum line after the pcv valve so all cylinders would clean! It does work! anyways after your done drive it after u let it idle 10 mins. the next day go out and inspect your spark plugs. wipe them off. mine missfired because it was wet and i lost some gas milage that time. other than that better trottle resonse and idle. aswell as engine vibration decrease. I only did the brake booster method!! the other 2 ways seem kida fishey to me! when u do drownd the car and it kills it- thats when u got the plugs wet. so u know they needed wipede down. oh ya....go slow with it to. let the vaccum suck it slowly...<-- lol.

 

Putting it in the gas tank also cleans the injectors. I Seafomed mine a couple months ago. Smoky as a **** but worth it.

 

From what I heard from 2gn.com, Seafoam in the gas tank does no more than Lucas, STP, or any other gas treatment.

I use Seafoam Spray. It's a lot easier, and safer to use, and it goes to all the cylinders.

 

You don't use the whole can when doing the intake so I just dump the rest in the gas tank.

 

It's not meant to do any more in the gas tank than any other gas treatment