My baby (g8 v6) is acting up and I'm not sure how to diagnose this particular issue. When I leave the car running in park, say at a gas station, when I return and put it in drive it doesn't put any power to the wheels. Not only this but my readout shows I'm in drive and the rpm gauge reacts with each push of the gas. Is my transmission failing? Or is this a sensor issue? It also did this once while driving and luckily I was in my driveway and not on the highway. Help!?!