I recently came up with the same theory that a stuck open EGR would displace oxygen and confuse the o2, causing negative fuel trims. Excited to learn how that is false so I can develop a better understanding. I'll watch the tomato sensor video. However, I'm logged in and the videos in this thread are showing as private. Any suggestions?
Where exactly are you looking?
There is no section 24 playlist on Scanner Danner Premium and all the videos in that playlist on YouTube are public.
EDIT: I see, those are dead links from when SD premium was hosted on YouTube.
But, congratulations! You just made the watch list!