I just bought a used 08 Elantra. It has rolled down a hill while in Park on an incline a few times now. It’s definitely in Park but it makes a clunking popping sound as it rolls down. I have to take it out of Park, Put it back in and it’s fine. I’m not talking just a slight roll back. I need to hit the breaks to stop it. I took it to Aamco because my regular mechanic doesn’t do transmissions. They said it was the shifting cable which the dealer said he would take care of. However the more that I’m reading about the parking pawl I’m thinking that is the problem. Has anyone else had this issue? Could the shifting cable cause it to make that popping sound? I’ve had no problems getting it into gear while it is flat. I would appreciate any feedback.