I found 2 new plugs in the Jimmy when I got it- they were AC-delco and on the box it says R43TS and the bosch has a longer part with threads on it- I did notice that because I looked up the delco online a few days ago and was gonna get 4 more and change them and seen they were the same number then I found this problem today( I havent been driving it) waiting till its running right, what does the blackness on the bosch plugs tell you?