Replaced the purge valve hose but that made no difference but given the damage I suppose it needed to be replaced. I found that when I disconnected the input solenoid on the right hand bank the 29cc and 29cd errors went away and the car ran really well without a misfire. I felt sure that this meant that the solenoid was faulty but when I replaced it with a new one the misfire, CEL and error codes (29cc and 29cd) reoccurred. When I disconnected the solenoid I got a solenoid disconnected error code but it did not generate a CEL.