Engine misfire could be caused by worn or broken motor mounts that raise the motor on one side while the vehicle is accelerating. The stress on the engine control wiring harness can cause breaks in the injector or sensor wires, which then causes drivability concerns such as poor fuel economy and engine misfires.Google+
Car Problem Reports
Mercury Cougar Damage to engine wire harness due to broken motor mount
Mercury Cougar Problem
Model Year Affected: 1996
Engines Affected: 3.8L V6, 4.6L V8
Visitor, 1996 Mercury Cougar, 3.8L V6
Notice motor mount on driver side gone.don't. Know how long its been out I don't drive it just wife to do errands.what do I need to do to fix it.