2012 Dodge Avenger drivetrain & axles problems

There is no heat on the passenger side but there is heat on the driver's side. There seems to be a mechanical defect with this vehicle because the vehicle stalled on a hill in park and started to roll down the hill and the brake and everything stopped working at that moment in the car. I also had another incident with the car stalling while driving and due to this it caused another accident. The car is also well kept, but it seems to have a mechanical defect

The only problem I have is that the engine sounds like a pea thrasher when its started on cold morning. (it sounds like a lifter that has lost its prime). Also, the transmission shifts hard, surges (over revs) when coming to s atop, and at times when its down shifting while going down a hill, it slams into lower gear.. There are additional body sounds that I haven't addressed yet. I was told by mechanics and service tech's that this was a common sound from my size engine.