GMC Yukon Spark Plug

Do These High Performance Plugs, Guaranteed For 100000 Miles, Need To Be Changed Then Or How Much Longer Can One Go?

I Have A 03 Yukon Denali Xl And Just Had My Spark Plug Changed. Everything Seems To Be Running Good But I Am Just Wondering . Do You Set...

I Am Changing The Plugs On My Yukon And The Boot Is Stuck To The Plug. I Don't Want To Tare The Boot And There Is A Metal Heat Shield Around...

We Checked The Spark Plugs And Even Removed Them And They Are Not Burnt Snd Gap Is Correct. Turned Engine Over We Get Good Spark, Tried...

Below On The Left Is Cylinder 6 Plug. On The Right Is Cylinder 8 Plug. Even After Installing New Plugs And Wires Engine Rubs Fine At Idle...