i do this once a year and still get a good amount of smoke. I change the plugs and oil a couple days later
i don't know what the writeup says, but it helps to have someone help you. The person starts the car with the brake booster line off, and you start pouring the seafoam into the line, but not all at once, do it gradually. The car will fight to stay running, but the person in the car should give the car more gas to keep the engine from dying. Once you finish pouring, have the person shut off the car and sit for 5 minutes. then start it back up after the brake booster is back on, and enjoy the smoke show