Idle validation switch,,, It's on the pedal you replaced....
Accelerator Pedal Sensor
The Accelerator Pedal (AP) sensor provides the PCM with the driver's demand for power. The AP sensor is a three-wire potentiometer that receives VREF from the PCM and returns a signal to the PCM directly proportional to the accelerator pedal position. The AP signal is used in calculating fuel quantity. Also, the AP input is used by the PCM to control the exhaust back-pressure regulator.
A PCM detected fault of the AP sensor will illuminate the Malfunction Indicator Lamp in the instrument cluster. An AP signal that is detected out of range, high or low, will cause the PCM to only allow the engine to operate at low idle.
Idle Validation Switch
The Idle Validation Switch verifies when the accelerator pedal is in the idle position. This switch protects against in-range failure of the AP sensor.
A PCM detected fault of the Idle Validation Switch will illuminate the Malfunction Indicator Lamp. An inoperative Idle Validation Switch detected by the PCM will only allow the engine to run at idle.