Sante Trouble

My 2001 Sante Fe, 114,000 mi, check engine light came on and the SUV shimmers as if it is miss firing. I replaced all the sparg plugs, thinking it may be a defective plug and trouble still exist. Any suggestions? By the way, does anyone know how to use the diagnostic system on the Sante Fe? I am also looking for a good maintenance book, of which have not been able to find. Thanks!!

i can't really answer your question.. but are you really at 114,000miles with it??? what engine if i may ask? I have a '02 2.4cyl with 41,000miles on it and the trans is shot and the engine is gettin there...