Mine will also stumble at idle from time to time and only when hot. I have never worried about it much.
Running the factory plugs as my plugs got to the house after I had already gotten the intake back together. Was more of a pain than I wanted to endure to take things off to get at the plugs in the middle of the SC install.
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Powertrain Warranty voided on 5/14/2011
Mod List:GTM Supercharger,SmartTop module, Oil Cooler, GT-R Start button, Nismo Exhaust, BC Racing ER Coilovers, Backup Camara
For eastwest: 
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