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threads getting long and I'm too lazy to reread but have you pulled and cleaned the cam position sensor. at that point you should check it with the multi meter. Sweede here had issues with them I know and found dirt cheap replacement ones.
The O2 sensor doesn't start working until it's up to temp after running for a bit. But even then it shouldn't make THAT big a difference in mapping. It's a corrective factor.
640 miles from Beth Page to Cedar Vale . Dusty