Time for new O2 sensors?

[justhereforinfo]

This cts-v has over 130k miles and original oxygen sensors. I switched to E85 about 6 month ago. Just recently I have been experiencing a surging when cold. During the first few minutes of startup, I get a new oscillation where my wideband goes lean to rich and the idle surges slowly. On this log it almost stalled, which makes me think its getting worse. After about 3-4 minutes of idle/run time, everything smooths out.

I noticed that once the O2 sensors reading tightens up, the AFR, idle and timing all smooth out. Should I toss some new Oxygen sensors in it?

22-12-25 18-25-28.hpl
CTSV with FPCM DW300 stock prv 65psi maf3.hpt

And yes, I know my FP is dropping in boost.

[justhereforinfo]

I should mention, that I did have a leaky intercooler brick replaced recently. So there was anti-freeze exposure. Just though about that. Probably a good idea to just replace them.

Update: new o2 sensors didnt fix this. It was my fueling in the tune. I shut off all fuel modifiers (ltft,dfco,o2sensors) and saw it was .80 at idle. I retuned the MAF and turned everything back on. Problem solved.