Vehicle Shudder problems of the 2013 Nissan Altima - part 2

Vehicle stutters and vibrates at lower speeds. Also their is a knocking sound coming from underneath the vehicle. Brought back to dealership 3 times since March. All 3 times I was told it is perfectly normal for the car. I read online that other people have experienced similar issues.

Vehicle has been in the service department five times for different things in less than 2 months. Main problem reported each time in service is my transmission. Between 20-50 mph and 1000-2500 rpm the car will violently shake and lose power. I have to press the gas pedal harder to get the car to stop shuddering and pick up acceleration. I have almost been involved in tow rear end collisions b/c of the lose of power and shuddering. Nissan states that I must wait for a reprogramming fix. I have filed a complaint with Nissan consumer affairs. In the meantime I have to sacrifice my safety? totally not acceptable. I have owned 3 previous Nissan products with no problems.

Purchased a new 2013 Altima sedan 3. 5sl in November 2012. At approximately 500 miles, upon acceleration from a stop, the car jerked violently for 2-3 seconds before kicking in and accelerating (as if driving a manual transmission and attempted to start in 4th gear). This has happened 2 more times since. Additionally, often while accelerating the rpms will drop significantly and the car will shudders before kicking back in and accelerating. Lastly, on occasion, while decelerating, the car will jerk harshly (as if driving a manual transmission and shifting into too low a gear for the speed). Took the car into dealership and they said they could not duplicate the issue. Contacted Nissan corporate 2/6/2013 and the representative told me she hadn't heard of anyone else having this problem, but that she would open a ticket. Called back to Nissan corporate 2/27/2013 to follow up and was told that my previous ticket had been closed.

Approximately two weeks after purchasing my brand new 2013 Altima 3. 5 s the car developed a shudder and vibration when I would accelerate slightly. It also occurred going up small hills, and when I would come to a complete stop then pull off (for instance at a red light). After noticing this, I scheduled an appointment with the dealer, and we did a test drive in hopes of mimicking the issue. The mechanic advised me that this was normal for a cvt engine, and that everything was fine. I wasn't quite convinced, but I wanted to trust his opinion, since this was my first time driving a car with a cvt engine. However, a few weeks passed and the shudder and vibration got worse. The car even jerked forward once when I was pressing on the brakes. This prompted me to schedule another visit with the dealer. This time the same mechanic from the first visit and the manager rode along with me. During this test drive the manager felt the sudden shudder, once we came to a complete stop and slightly accelerated. This prompted them to replace my transmission, not even 30 days after my purchase. I picked my car up from the dealer on 12/7/12 after they changed the transmission and the car drove perfectly fine. The bad news is that now the car has developed the same shudder and vibration even more now. I will be calling for another appointment tomorrow, because something has to be done about this. It's very dangerous, especially when this happens and you have another car riding directly behind you. ## VIN failed.