NHTSA Complaint #11461348 — 2005 MERCURY SABLE

Purchased vehicle from a private seller 10 days prior to incident. Seller informed me they had replaced throttle body sensor to fix unintended acceleration issues. Drove vehicle home on 4/10/22 with one incident on highway where I attempted to slow vehicle after reaching approx 70mph, and vehicle seemed to jolt/shudder as if unable to brake smoothly. Did not drive again til 4/18/22: I attempted to drive vehicle to tire shop to have new tires installed. After backing out of driveway, I accelerated quickly to approx. 25mph. Acceleration continued past 25mph despite me letting off the gas pedal. I hit the brakes and felt the acceleration continuing to push against them, causing the car to jolt/shake with the application of the brakes. I slowed to a stop at a nearby traffic light, where the engine continued to rev at approx. 2000rpm. When I let off the brakes and drove through the intersection, the car continued to accelerate to around 30-35mph without me pressing the gas pedal at all. I again applied the brakes to regain control of the vehicle, and it again jolted against them as the engine continued to rev excessively. After the next light, I pulled over and placed the car in park. Here, engine stopped revving high, and when I put it in drive again, the issue had ceased. Reading up on complains, have found dozens of similar driver issues with uncontrollable acceleration on similar model-year Mercury Sables and Ford Tauruses, with no clear solution to the issue to allow me to safely drive this vehicle with my child inside. My and my child's safety is placed at risk with increased chance of brake failure, without recourse from manufacturer or NHTSA, who've concluded their investigation despite frequent complaints. Problem has not yet been confirmed by dealer/ISC. Vehicle has not been inspected. No check engine lights or other warning of issue from vehicle. At no point was gas pedal physically stuck in the acceleration position. Issue is known to NHTSA, but not resolved.