I've read the TSB for the 3.7L having a whistle noise come from the throttle body, but I was wondering if anyone with a 4.0L had this issue as well?
I've literally just bought my Nitro and I'm taking it in for service because it whistles under acceleration. That and the rear makes a creaking noise when I first drive it, and the front of the roof rack is cracked and warped on the passenger side. Also the exhaust has what I feel is an unacceptable amount of rust for such a new car (was a demo with 6k miles). To say that my nitro isn't making a very good first impression is an understatement. For crying out loud it's a $30,000 car, you'd think they'd have used slightly better materials.
I've driven many dodges before (mostly neons) and have NEVER had any quality issues... go figure?
Have not had the same issues as you, but they should all be addressable under warranty, free of charge, buy your Dealer. The salesman that drove this Nitro should have reported any issues with it to the service department, before it was put back in inventory, for sale!
I recently had my U-connect radio system up-dated thanks to info supplied here (TBS). For some reason Dealers do not seem to address TBS issues when the vehicle is in stock or in your case a Demo. They wait till it is sold! Not smart on their part, and if your Dealer's Service Department is as slow as most around here (lack of work) it would be wise to perform and correct issues on their in-stock inventory, not only for their future inventory owners, but to generate income for their service departments and their mechanics. Keep in mind that Dealers make more profit from warranty repairs, than customer pay.
Make a good record, in writing, of your issues. Give your Dealer a chance to correct them first, then if not pleased, take it back with a printed copy of the TBS from this Site, and ask them if this could be the problem?
Good Luck, and let us know how everything works out.