2019 camaro ss rich after headers

[bkg06gto]

Car is a 2019 camaro ss a10. Rotofab and Texas speed 1 7/8 long tube, high flow cats and stock npp exhaust.

Friend brought it over because running rich even after being "tuned" The strange part is, it's only running rich at idle and low load areas,(-21% fuel trims, wideband and narrow bands confirmed) and when you come to a stop it goes incredibly rich (.65 on wideband) stumbles then back up to stoich.

File didn't look like much was done, I fooled around with MAF scaling and VE some, but nothing affected it. No matter what I changed, the error stayed -21%.

I'm thinking maybe a small exhaust leak somewhere we can't hear? Strange though heavier cruise and WOT are about spot on.

I'd post the logs, but for some reason the files won't open with a error message. I can get more tonight, just looking for a starting point more than anything.

[bkg06gto]

I figured it out, o2 sensors needed some work, airflow model out of wack. Alot of odd changes/spark changes etc.