hmmmmmmm....seems like it has to be the motor mounts. I had that problem with my mystique, and replacing the mounts took care of the problem. I replaced all four, but the one on the driver's side fender had the most effect. What about your other two mounts? I don't know of anything else that could be causing it.
95 Contour Zetec, ATX (wrecked, sitting in the barn)
95 Mystique Zetec, MTX
2000 Taurus SEL 3.0L Duratec
1994 Crown Victoria LX 4.6 V8
1993 Chevy Silverado 4.3 V6
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