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Old 02-24-2013, 07:56 AM
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That's the intake air temp sensor. While it does need to be plugged in and working, it won't cause a cylinder specific misfire. Since you seem to have checked the plenum pan visually through the throttle body, I'm posting the diasgnostic for this as Chrysler recommends. One other thing - try removing the serpentine belt and running the engine and see if the problem goes away. It's rare, but I have seen a perceived misfire turn out to be an accessory problem.
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