HELP!!!!!!!!! My '91 VDP is throwing a fault of "PAO Fail".
          This code is not any any of my service or shop manuals and
          the local dealer has never seen it.  Does anyone know what
          this is????????    
           Engine:  4.0 L6
           Tranny:  J-Gate
           Symtoms:  Good spark; good fuel-rail pressure; injectors not
                       opening. (Will start with starter fluid sprayed
                        in TB.)
    