here are my plans....stolen from here

# Park car in a well-ventilated area.
# Start car and run until it reaches closed loop (generally 5-10 minutes, and above 160°).
# Open hood.
# Unplug PCV valve
# Place end of hose into a shallow cup containing 1/3 of a bottle of Seafoam Motor Treatment. Allow it to suck liquid out until the engine starts to idle noticeably lower; then remove the hose from the cup. Do not pour enough to stall the engine yet.
# Repeat the above until between 1/3 and 1/2 of the liquid has been used.
# Now let enough of the liquid be sucked in until it stalls the engine.
# Turn off ignition.
# Replace PCV hose.
# Pour the remaining 2/3-1/2 of Carbon Cleaner into crankcase (through the oil filler tube).
# Pour other full bottle of Carbon Cleaner liquid into gas tank.

but I think I read somewhere that I should remove the PCV valve before starting the engine and also turning off the engine before replacing the PCV valve. I'll check it out.