I have a 05 Dodge Caravan 3.8L with 144,000. I have a shutter as I accelerate. It starts around 35 mph and causes a shaking vibration like I am driving into a brake down lane. No codes. This started recently and seems to be worse when the car is cold. Similar issue with T&C I have. Very strange. A friend said torque converter but I am hoping some had a similar issue.