I have a 2006 Camry with a vibration I'm trying to figure out......

The darn thing comes and goes, but when it comes, it sets in about 45 mph and is present up to around 65.....

It is very intermittent. Might happen every third time I drive.

I can't associate it with any particular road condition or incline/decline.... Also, tried shifting into/out of neutral while driving at these speeds, and it doesn't go away or change when I go to N or back to D.....

It's a very high frequency vibration.... Almost a buzz. I can't feel it through the wheel or the dash, but I can sort of hear it, and I can definitely feel it through the accelerator pedal more than anything.....

Any ideas what could cause this??

 

Start by checked tires for damage, unusual wear, etc and for a bent rim.