I can tell you all for sure...don't ever buy Bosch Platium Plugs. I put them in my wife Bonniville and it would not run right. I finally took them out and put some AC's in it and it was fine. Then I had a 98 Stratus that would not idle right when I bought it and I checked..sure enough...Bosch Platiums so I switched them out with Autolights and that fixed it.
Rob