Hey guys, 2005 Element on-demand AWD, AT with about 165k here. Over the last few months my Element has developed a pulsating shutter or intermittent vibration while driving at highway speeds that is getting worse. It seems more predominate on the driver's side if I had to pick a side and happens most often when the steering wheel is pointing straight. I've read it could be everything from tires to transmission. Help me diagnose this!