i just recently changed the plugs and wires in my dads 94 3.4L and i also had bought seafoam. my question is if i add the seafoam through the main vacuum line will that foul the plugs? ive been told by someone that it could and i definately dont want to have to change them again. i know you can add the stuff through the fuel tank or the oil but id like to get the benefits of adding it directly into the main vacuum line because the car could use it. any suggestions?

 

your suppost to do it before the plugs

 

yeah i know that but i forgot about doing it until i had everything done