Sounds like the engine is running in 'limp in' mode, which should have turned on the check engine light. Take the truck to Autozone or a similar business to read out the computer for free. Also check the check engine light bulb at start-up--it should light as a test at that time. Suspect that the connections to the O2 sensor may have come loose or was damaged during the replacement. Hope this gets you running right again!
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