Car shudders very badly while accelerating! on highways and normal roads. It won't accelerate like it used to and loss of power. Make a loud hissing kind of noise randomly as well. I maintain it regularly, oil changes, brakes, fluids etc. No dealership can seem to figure it out. I have taken it to 2 Chevy dealers and got two different answers. One said a torque converter and the other could not duplicate the problem. Said all tests came back normal. It is very annoying and I don't feel safe traveling distances in the car.

While driving down the interstate the whole car starts to shake like driving over rumble strips and loses power, stops after just a few seconds but very noticeable to everyone in car not just the driver... This week (Monday) I took the car to the dealer where it was purchased and they could not find anything, so on Wednesday they took it to another Chevrolet dealership and between the 2 they put over 175 miles on my car and still could not figure it out. They both say that they can't find the problem. It is very frustrating. Yes I am a woman, but it has happened while my husband was driving it too. Neither of us use the Manual shift on the steering wheel either...