2006 Infiniti FX35 Feel Heavy or Sluggish when Accelerating any ideas why?

Hi Guys,

I have a 2006 Infiniti Fx35 since September 2009 that I bought with only 29,638 Miles. Recently I have not been driving my car as much as I use too due to having another car. Today I drove it and it feels heavy or sluggish when hitting the gas and accelerating. The Fx currently have 112,300 miles and since it been in my hands I have never replace the spark plugs or ignitions coils. I change the engine oil religiously every 5,000 to 7,500 miles and changed the transmission oil back in June 2014 (**4-5 Quarts of Nissan J-Matic Fluid**). Both differential oil was changed back in June 2014 when the odometer hit 96,000 miles. Any services or upgrades you guys here at the forum would recommend to add that acceleration spark to my fx35? Have any of you guys experienced this with your fx35 Gen 1?
 
Yeah I believe that I'm way overdue for new spark plug. Any one in particular spark plug brand and type you would recommend? I was thinking NGK iridium spark plug instead of the regular NGK spark plug.


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