No.42

Hi all, I bought my '03 Camry Sportivo 2.4L a little while ago. I've since noticed that when in 5th gear I get a vibration/rattle through the gear stick. You can hear it as well (that's what alerted me initially to it). The sound and vibration go away if I have no throttle on. It also sometimes goes away if I pop it out of 5th and then slot it back in. Does anyone have any idea what could be causing this? Many thanks in advance! James