Accelerator Pedal Sensor Problems of Lincoln LS

My 2005 Lincoln Ls has been going into an etc failsafe mode almost every other day for last four months. Dealership has told me it is a faulty accelerator pedal sensor. However, this part was and continues to be on a "national backorder". I have avoided countless crashes due to this failure while merging into traffic. Once the etc failure comes on, I lose all accelerator power and merely coast in an attempt to get off highway so I can restart the car. On one particular day this happened 4 times over the course of driving about 15 miles. I am putting the incident date as when I took it to dealership last however this issue is on going.

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The contact owns a 2005 Lincoln Ls. The contact stated that the accelerator pedal was becoming stuck while attempting to operate the vehicle. While driving less than 65 mph, she felt as if something were stuck underneath the accelerator pedal and it would resist force. The dealer could not duplicate the failure; however, the diagnostic determined that the throttle failed. The failure persisted and the vehicle was taken to an independent mechanic, who installed a throttle actuator control, gasket, and accelerator pedal sensor to remedy the failure. After the repairs, the parking brake warning indicator illuminated on the instrument panel. The mechanic assured her that the brakes were replaced and the instrument panel displayed a faulty warning message. To date, the failure still cannot be duplicated and the contact is awaiting the arrival of a part that would apparently remedy the failure. The failure mileage was 63,295 and current mileage was 66,000.