2001 LS V8 runs rough cold, fine when warm

I have a blue driver OBD so hopefully i can check the same things as your Forescan reader does
 
it has one of those on the one side of course the other side has no clips their internal. Need a special tool that’s cheap at least to remove it really sucks why they just wouldn’t have 2 clips
 
I know I wish I could know for sure instead of just changing it out I cleaned it it seemed to run good then starts acting up again
 

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