I have a 2008 GMC sierra sle with the 6.0 v Max motor. I was driving down the road and heard a loud bang and my truck started shaking and started ticking really really loud. Took it to oriellys and hooked up the computer and it said cylinder 7 misfire. Started changing the plugs and when I took out number 7 plug it had oil on it! If anyone knows anything about this please help!