[jsinton]

Your P0441 code has nothing to do with the PCV valve. It refers to the EVAP system, which is the system to collect and burn evaporating gas vapors from the fuel tank. It might be as simple as a a loose or defective gas cap, but typically in these cars, someone has pulled the hose off the charcoal canister because the EVAP system was FUBAR and didn't allow you to fill you gas tank... i.e. the gas pump shuts off all the time because of pressure. It doesn't affect performance in the least.

As far as the power problem... Did you check the timing belt recently? I'd do an inspection on the timing belt. Just remove to four little bolts from the timing belt cover on top and take the top cover off. Make sure it's in good shape, and adjust the tension accordingly.