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I'm thinking the Bosch O2 might be my issue as it was the last thing I replaced.
I don't recall the truck had this cold start issue before the new O2... and I've heard in some applications the 1 wire Bosch units don't light off fast enough.
My buddy scanned it and said the O2 readings were correct during the problem times but my gut says try a different O2 sensor...
FWIW - #15 - https://harristuning.com/Tbi/recommended-350-tbi-mods/