2001 Dodge Intrepid can I fix the problem or do I need a ne

Noises problem
2001 Dodge Intrepid 6 cyl Automatic 120000 miles

I currently have a 2001 Dodge Intrepid Im not driving it because I heard a knocking noise I took it to this shop and they said it was coming from the motor and my brother thinks its the rockers that broke and its loose. When I give it gas and its parked you can hear the noise. What could be wrong? So Is it replacing the engine or buying another car? PLease help me. Eva