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Stop buying cheap sensors man the only ones that ever worked for me was the ones at Napa. My brother had a 98 Dodge dakota and his pcm went out and when it did he was like 3,000 miles from home and the truck did not even start.
About your only hope is to take the truck out for a fast and long ride. You've got to get the catalyst HOT! It may help clean it out. Otherwise, replace.