Have an 82 Aspencade Its new to me last 5 months,The radio tuner on the bar scans but when it stops on a staion it wont land on a power staion .The radio itself does the same thing.We cant figure why it wont stop on a workable staion.Questionis is ,it the radio or the bar tuner,or both Need help trying to figure where to look or what could be the problem.Thanks for any help