You got either a throttle body that is intermittently stuck or the ECU is going bad internally. make sure the 02 sensor and A/F sensor are working first.
P0606-ECM / PCM Processor
The ECM continuously monitors its internal processors (CPUs), A/F sensor transistors and heated oxygen sensor (HO2S) transistors. This self-check ensures that the ECM is functioning properly.
P2118-Throttle Actuator Control Motor Current Range / Performance
The ETCS (Electronic Throttle Control System) has a dedicated power supply circuit. The voltage (+BM) is monitored and when it is low (less than 4 V), the ECM determines that there is a malfunction in the ETCS and cuts off the current to the throttle actuator.