BTW: PVC = positive crankcase ventilation
HC = hydro carbons ( burning oil and/or rich mixture )
Dont plug the PCV, thats bad, just vent it into the engine compartment somewhere. Make sure you hide it well though, make it look like everything is still hooked up. A PCV valve takes the vaporised oil from the crank case and passes it into the intake system so it can be burned. They used to just vent it to the atmosphere but enviromentalists complained because its bad for the green stuff. Burning the oil vapours, incinerates it an turnes it into CO and some other stuff thats a little better for the air. If they dont inspect the engine before testing, try putting a tee fitting between the PCV and the intake, plug the port into the intake and run another line out of the tee and down in behind the engine. Youll test cleaner and youll make a little bit more power cuz your not burning the less volitile oil vapour. Nothing that youll really notice though. I know this works, ive done it and tested it in training mode on the emissions dyno at work.
If that doesnt work, we have this stuff in Canada called guarenteed to pass. Its a fuel addative that really helps in some casses. You put a bottle of the stuff in a full tank, run it though and dyno after you fill up again.
Good luck