my run sputters going over 45 mph on 2003 Ford Expedition

no power when on highway and trying to pass cars

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2 answers
CHECK THE CATALETC CONVERTER
You have a check engine light on. What are the trouble codes.
DO NOT REPLACE THE CATALYTIC CONVERTORS!!! That is a lot of money to guess.
Contact me at jmgrhm30@gmail.com for help.