Codes P170 & (pending) P130

[BENZVETTE]

I went to my local Schuck's dealer and they were able to assist me with pulling some codes.
My print out is as follows...

Trouble Codes:
P170 Fuel Trim Malfunction (Bank 1)

Pending Codes:
P130 O2 Sesor Circuit Malfunction (Bank 1 Sensor 1)

Freeze Codes:
P170 Fuel Trim Malfunction (Bank 1)

Problem: My CE light is on. When the car is stone cold, the car starts rough with idle fluctuating between 1200 & 500 rpms until it warms up (3-5 minutes). After that, the car starts (when warm) and drives without issue(s).

Could it be that I have a bad O2 sensor (since the CAT is cold)? Or would it be the Air Mass Sensor?
Are these both easy DIY?

Oh yea, this is a 2000 C230 w/96K miles.
Thanks!
Shawn