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Check engine light on.  PO446 diagnostic code.  I changed the evap vent valve unit, but no help.  Other symptom is  drastic hesitation and low acceleration when gas pedal pushed.  This symptom goes away after about 2 minutes of engine warm up.  Overall acceleration, even after warm up, degraded.
Vehicle: 2000 GMC Sonoma V6 vortek

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P0446 Evaporative emission incorrect purge flow

This code you have is caused by the FTP (Fuel tank pressure ) sensor, what happens is the FTP sees incorrect fuel tank vacuum decay and set this code. The fuel tank pressure sensor is on the top of the fuel pump module, You might be able to reach the top of the fuel pump module and remove the  FTP and install another FTP sensor. As for your degraded acceleration  I would suspect the fuel pressure regulator., When it begins to fail it usually at start up, Smell your oil dipstick for any raw fuel smell.

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