Looking for opinions on what would cause the engine in my Pathfinder to have a rough idle. I have had it to two different Nissan dealers hoping they could resolve problem before warranty expires. One replaced the motor mounts and that seemed to overshadow the roughness of the bad idle, then it came back @ 1000 miles later. Both have tried to state it is a common idle on the V6. I have told them to check the Idle Control Valve and the Mass Airflow Sensor. Neither seemed concern with checking these two to see if they are the problem. Any ideas? This is my first and for now will be my last Nissan.