Here is a strange on. On my V-6 AWD 2006 Grand Cherokee Laredo, I have a vibration. It isn't there all of the time but when it occurs, it gets more violent the farther you drive. It starts of barely felt but it intensifies as you continue to drive. But, and here is where it gets strange, if you pull over and stop, it goes away. If I am coming up to a stop sign or a traffic light and I stop, it goes away when I pull out. It might not do it again for days. I am at the point now that I might just floor it the next time it happens and let whatever is causing it to break. Since it is intermittent, I have ruled out the obvious, universals, CV joints, tires, driveshaft.
Any clues what could be causing this vibration?