Seafoam,suck 1/3 through the intake Via a vacuum hose that feeds to all cylinders. I mean if u have to, go off the vacuum tree. Make sure as soon as u get all of it into your engine, shut the car off, then walk away for at least 30 minutes, and let it cook all the carbon out of your intake and off your valves! Then pour the rest in your gas tank. Your car will try to die when you suck it into your intake, so It's best to have someone keeping your car at like 2500-3000 rpm's while your doing it, and ready to kill the engine once It's all inside. When you drive it, be ready to piss off the neighbors, cause it will smoke like a freight train!!! The more smoke, the more carbon It's burning!!