I took the plunge this weekend and changed the plugs. I was starting to experience a miss and my mileage was going in the crapper, worst then usual that is. I went with the seafoam induction service / impact wrench with a engine. All went well. I switched over to the champion double platinum plugs with some anti seize on them. The only place I couldn't get the impact wrench in was the passenger side rear most plug. It was tight back there; ended up just using a 3/8 ratchet. Thank God it was willing to come out.