what are symptoms of a bad timing chain on my ford mustang?

[Gene]

Can some1 explain to me please what the symptoms of a bad timing chain is,will there be any vibrations and where would you feel the vibrations ,my 2003 ford mustang base model automatic and rear wheel drive,my car does not spit and sputter but it has 99000 km and i dont think the timing chains have been changed so please list some symptoms of a bad timing chain