The Flashing 0 indicates a loss of serial data. Usually caused by wires in the wiring harness that have rubbed through on the condensor on the drivers side. Depending on how bad it is, electrical tape could fix this, if not you may have to splice in new sections of wire.
As far as plugs, you'd be best running factory temp AC Delco plugs.
I second the ZZP wires causing issues, however they just released a new version which is supposed to take care of the issues that all previous versions had.