You should take you car into a dealership as soon as possible. The code P1320 means cylinder misfire. The stalling feel, acceleration hesitance and vibration is caused by a cylinder misfire. It is possible that the coils are bad. So this should be checked and fixed immediately or else your engine could be totally ruined. You definitely will not be able to fix this your self unless you are an auto technician or someone with a good knowledge of mechanical engineering. Check out the source it should definitely be able to help you.