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I got my OEM sparkplugs this Saturday and decided to change the sparkplug. PO changed at 80K miles and now my 3GS has 135k mi.
What I found was the sparkplug that was in my 3GS was Autolite XP sparkplugs, not OEM. Changed all 6 right away and boy, what a difference in smoothness in acceleration!
cool whats the torque supposed to be on these? did you use a craftsman torque wrench? i was considering buying a cheap one at harbor fright for $9.99… please let me know. thanks