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IAT's in JB4 are PRE-turbo temps....aka mostly useless.
Ah life of being the Infiniti stepchild in BMS mostly BMW world! Mislabel the useful charge air coolant temp and clearly provide you this one (which you can get from any exterior thermometer!)

Nick, reason you see this go up at idle is because it is pulling stagnant air from and near the engine compartment...once you get some speed this should be very close to the ambient temp that day (which you probably already knew!)
 
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