I have a 2003 Audi A4 3.0 v6 CVT auto transmission 2wheel drive. Earlier the car was jerking and hesitating when it switched gears and the "PRND" were blinking on the cluster. The most recent jerk resulted in the car to not go into any gear at all. When I put it into reverse or drive it does nudge a little bit as if it put into gear but when you accelerate it only revs up the RPMs and doesn't move. what can be the problem?