i just got my fuel injectors cleaned, at Jiffy Lube, i got my radiator change/coolant flush for $50, and the guy there was cool, he had a hooked up older generation mustang and was into bikes, and so he saw my car, and said he would do the fuel injection on side for me, for $30. LOL, he stole the stuff right behind his boss's back LOL. he did my coolant flush and officially charged me that, and then didnt ring up the fuel injectors, i just gave him the cash and left. he did the work outside LOL... anyway, my car felt a little smoother, but u kno, what helped more man.. did u say u didnt do anything to your tranny yet? i would get ur transmission oil changed if anything, if u havent done that yet, that felt way better, shifts were smoother, and i could change gears and it didnt make the "chuking" noise sometimes, when u go into reverse, its a more noticeable difference of all the services i've done so far(beside change spark plugs, that too made my car feel smoother, denso iridiums are nice). i have a 6th generation also, if that means anything.