I just did get a 2004 f 150 FX4 with 147,000 miles on it..Would it hurt to run some seafoam through it? I heard some talk about pulling off some kind of vaccum hose and letting that suck in the seafoam..whats the purpose of sucking it through the vaccum hose? I'd like to do it through vaccum hose if I can and it's not gonna hurt anything but I'm not mechanically inclined and would probabily end up breaking something or screwing something up....