P1121: Electric Throttle Control Actuator Circuit
WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
While vehicle is driving, it slows down gradually by fuel cut. After vehicle stops, engine stalls. Engine can restart in Park or Neutral, but engine speed will not exceed 1000 RPM or more.