After only having my new jeep for about a month, I decided to change the plugs. The jeep showed no signs of misfire or hesitation, but for my piece of mind and not knowing how old the plugs were, I decided to change them anyway.. Plus, with 86,000 I was kinda curious what type of plugs they were running. Bosch Platlium +4 were in it and they looked a little wore out.. I installed the NGK V-Power and it seems to start faster and Idels around 750 in park. (Auto).. The big thing I notice was that a vibration in the dash I had when I would first take off for a second or two is gone. Seemed kinda weird, but I should know a little more by the weekend.. Also, the Coil pack setup was a little new and was hoping I got all the boots seated correctly.. If I did have one not all the way on, what type of signs would show.. I dont have any missing or notice anything really different between the two plugs, besides the quicker start and vibration gone..
Here is a pick of the Bosch plugs.. Not sure how many miles are on these..