Hey everyone! I finally found out what was wrong with my cars strange idling problem. I found that my car would idle at about 2000rpm when in neutral or placed in park after long sustained driving!! I thought maybe it was a dirty throttle body but after cleaning and 2 computer checks by Nissan it was a faulty idle control module that was causeing my baby to be naughty... oh well its now waiting for the new module to arrive from Melbourne. Then all will be good. Thanks everyone for the sugestions and help... :P