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Google says you probably are going to have to have the Throttle Position sensor or the entire Throttle Body replaced, however it looked like sometimes the dealer just reset the ECU. I'd take it to the dealer.
it happened to me. Pop the hood, unclip the TB sensor.. look to see if there is any grime in it, reconnect securely. Then, just do the pedal reset and you'll be fine... If you don't know the pedal procedure search for SES reset on here