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the fuel tank pressure sensor may be the problem. but first check that gas cap is tight and the seal is good on cap. auto parts store will tell you the location of the sensor,or call dealer to find out.
CODE PO705 IS DTR SENSOR TR SENSOR CIRCUIT MALFUNCTION. POSSIBLE CAUSES, DTR OR TR SENSOR CONNECTOR IS DAMAGED OR SHORTED, DTR OR TR SENSOR SIGNAL CIRCUIT IS OPEN OR SHORTED TO GROUND, DTR OR TR SENSOR SIGNAL CIRCUIT IS SHORTED TO VREF 5V, DTR OR TR SENSOR DAMAGED, PCM HAS FAILED.
IT ALMOST SOUNDS LIKE YOU MAY HAVE A VACUUM LEAK SOMEWHERE. USE A LENGTH OF RUBBER HOSE AND HOLD IT UP TO YOUR EAR TO PIN-POINT THE LOCATION OF A VACUUM LEAK. HOPE THIS HELPS. LET ME KNOW PLEASE. THANK YOU IN ADVANCE FOR AN HONEST RATING AND THANKS FOR USING FIX-YA. P.S. EGR VALVE IS VACUUM ACTUATED