Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB

Alright gents, I need a little help brainstorming. Ever since this last snowstorm my car has been running rich, I will explain below.

What:
To start, I am using an aem wideband and running E70 (winter blend). My cars afr has always fluctuated a bit while cruising (hwy speeds, constant throttle), usually stays around 14.5-7 but occasionally would dip down to 13.9 for a second and maybe up to 15.1. Idle was always good around 14.7. Now when I cruise I'm seeing pretty consistent 13.0-13.5 with occasional dips down to 12.7-9 and still occasionally back up to 14.5-8. Idle I see 13.0-13.5 with occasional spikes up to normal range. I haven't got on it since this has been happening but light throttle accelerating is still mid 13's.

When:
This all started happening after the big snowstorm we got last week. I only drive the car twice a week as I work from home but am required two days in the office. So last week we got absolutely dumped on, somewhere in the 12-16 inches of snow. I wasn't watching the weather closely enough and by the time I was heading home it was brutal out. I have good snow tires on the car but it was damn near white out blizzard conditions and the deep snow was pulling me all over on the road. I put the car in track mode as the traction control was coming on too much and was able to make it 90% of the way home. Once I got to my neighborhood road it hadn't seen traffic and I was essentially plowing my way through. I'm not sure if it was because of the traction control but there were a few instances when I was spinning in this deep snow that felt like wheel hop. It felt almost exactly like wheel hop when you're spinning the front wheels in fwd, the whole car was shuttering pretty good. I clutched in and pretty quickly came to a stop trying to stop it from hopping, and that's where I got stuck. Lol I opened my door and it literally pushed snow out of the way to open, so snow was higher than my door level. A neighbor was able to help me shovel it out and after a few hours and a few more times of getting stuck in my neighborhood I made it home.

Diagnosis:
I gave everything a once over and didn't notice anything right off the bat. The two first things I'm going to try are 1. Pulling the negative terminal and resetting the computer. Thinking maybe it logged some knock events while hopping and the computer is remembering/compensating for those. Not sure if that even makes sense but its easy enough to try. And 2. boost leak test, I can pretty easily hook up my air compressor and see if anything popped loose

Help:
I'm not really sure what else to look at. Thinking maybe it is actually over fueling so maybe an injector or di seal, or maybe the di computer rattled loose. Just looking for some possibilities or things to look at. I have pretty limited time to look at it at home and when its freezing out and I don't have a heated garage I want to spend as little time out there as possible.

Any help is appreciated!
Thank you