'92 5.8l
#2
#4
there arent many shops that do those carbon vacs anymore, at least not many that i see. dealerships may still do them, not completely sure. but seafoam works well. i've seen some engines that has had seafoam ran through it and it works real well. the only negative things that i've heard is that all the crap cleaned out and thrown into the exhaust system can end up clogging up the cat convertor.