OEM Copper Plugs, I'm a believer!
Just tuned up my 2004 GC, WJ, Laredo 4X4. I used the NGK OEM copper plugs. The last time I tuned it up was 45,000 miles ago, and ignorantly used Champion 3034 single plats. Since I've been a member of the forum I've been schooled about spark plugs. I wish I would have taken these 3034's out sooner. The Jeep performs better in every single way, especially idle...Here is what I am confused about, and my question: Why the hell does Champion spec 3034 single plats for our vehicles (WJ 4.0's with DIS ignition)???