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CE light came on. OBDll P0496 purge valve solenoid, DTC P0171 vacuum leak detected...I unplugged the purge valve solenoid, used a vacuum gauge...no problem with vacuum, I checked valve cover for vacuum suction...no problem found....Can anyone tell me why the codes are triggered if both systems are testing 'normal'? Engine hesitates sometimes.
 

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Purge valve could be sticking open it happens with these.
 
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