It needed a new torque converter. Now at about 38miles an hour it feels like it wants to shudder or a wheel is out of balance they also did the computer flash did that first said it was okay but one torque converter later found out it was not. I will keep my Nitro for a while but I just feel like it will never be right and something else will happen to it. I will get something else long before the warranty is gone. It really is a shame because I fell in love with it but I don't think it is a good vehicle