My daughter had the same problem on her Ford Escape. The problem is in the throttle body. There is no mechanical cable connecting the gas pedal to the throttle body it's all done by computer. A position sensor on the pedal and a servo motor in the TB unit with the ECM controlling it as well as the transmission. When it fails it acts just like the old style throttle cable broke. Ford has TSB's out on several model throttle bodies.
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