08 model reduced engine power/general electrical issues

I've been getting the reduced engine power message for a while now randomly the car
will actually choke down and stall out when i come to a stop sometimes. It is usually
the worst when the car sits in the sun all day other times it will drive fine. I had it
scanned and it came back with P2120 and P2138 which is apparently a voltage issue
with the Accelerator Pedal Position Sensor.  I've also been having other random
electrical issues though one of the headlight connectors burnt out a few months ago
and the door locks will randomly cycle and pop the trunk when i turn the car on
sometimes, the clock and date reset randomly as well. Anyone else had these issues
im wondering if i need to replace the accelerator pedal assembly or if its another
electrical issue.