Refer "Parallel Concurrent Processing (PCP) Environment " session in Concurrent Processing - Best Practices for Performance for Concurrent Managers in E-Business Suite (Doc ID 1057802.1)
Concurrent Processing - What is FNDREVIVER and How Is It Set? (Doc ID 466752.1)
Check the above MOS and see if you miss any of the setup in your environment.
-Chiranjeevi M A
In PCP if you shutdown normally on one node it will shutdown on other node also. Just kill Service Manager on that node and other managers would move to another node.