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The symptoms described indicates bad engine mounts. When the mounts are bad, vibrations from the engine are not dampened resulting in them being transmitted to the vehicle interior, especially the dash and steering.
Working the power windows or A/C would draw more current from the alrternator which would load it and cause it to work harder. This would increase the vibrations felt.
Sunday, May 3rd, 2009 AT 1:59 AM