The sensor you are looking for is located on top of the fuel tank. It is actually called an EVAP Fuel Tank Pressure Sensor.
SOURCE: Random misfire code CAT efficiency code evap pressure sensor
it can be two things the cat pluging up or the evap canister valve is stuck open or the fuse is blown check fuses first if ya need more help post here and I will give ya some more info.
avid101
SOURCE: emission failure on 2001 chevy blazer 4.3-
your vehicle has a vent valve solenoid located on the evap canister under the back end of the vehicle. You most likely have a bad vaccuum line going to the evap caniser. Have the vehicle smoke tested to verify. If no leaks are found replace the vent valve solenoid
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