If and When you change your plugs make sure you go with the cheap NGK plugs (like $1.99) each don't go for the fancy /expensive ones they aren't going to work as good.
Just to let you know, mine was running like crap a few weeks ago, kept trying to stall out at low speeds and at stop lights. Until one day it stopped altogether on the way home from work. got a tow home, there were teeth missing off the timing belt so I changed that out and put in new plugs too and I have to tell you, in the five years I have owned this vehicle it is the BEST it has ever run.