Lately my car has started to stutter round 40mph under light power conditions. When I more aggressively press accelerator the stutter stops. I do not notice any unusual sounds from engine nor transmission. And there are no leaks on garage floor. It is the AWD model.
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Have you replaced any tires recently??
Have you checked your tire pressures recently and corrected if needed??
Try just depressing the brake pedal hard enough to turn the brake lights on but not slow the vehicle any with your left foot to see if it affects the shutter…