1. An implantable medical device, comprising: a neural stimulator adapted to generate neural stimulation signals with appropriate signal characteristics to provide neural stimulation therapy; an electrode configuration tester for testing a first electrode configuration for stimulating a desired neural target; and a controller to control the neural stimulator to selectively provide a first neural stimulation signal with appropriate signal characteristics to stimulate the desired neural target using the first electrical configuration and a second neural stimulation signal with appropriate signal characteristics to stimulate the desired neural target using a second electrode configuration, and adapted to communicate with the electrode configuration tester and to respond to an indication that an efficacy of the first electrode configuration is lower than a threshold by providing the neural stimulation using the second neural stimulation signal.