ok so i did it backwards. i changed the oil, and then i put in the seafoam. no what? do i have to change it again? also what is the vacuum line? is it the tube connected to where the air filter is? if i take the air filter cover off, there is a large valve that depresses when i press on it and comes back up, is that where the seafoam will be going? should take the cover off and pour it in there directly? when will the excessive smoking from the exhaust occur? sorry i have so many questions, but im trying to pass smog and i need to save money right now because i need a new rear axle as well ($650.00 or somewhere around there, installed). thanks again for your speedy reply