Infiniti G37 Cylinder Head

I've Been Having An Intermittent Multiple Misfire Issue For The Past Few Months. I Was Having The Same Issue A Little Over A Year Ago...

I Started My Car After Work Yesterday And Within 60 Seconds, The Cel Came On And The Idle Wouldn't Come Down Below About 1k, Even After...

While Replacing The Valve Cover Gasket And Spark Plug Tube Seal On The Passenger Side (i Was Getting Misfire Codes From Cylinders 3 And 5...