When driving my 2005 Chrysler 300c it goes only 40mph. Need to know the cause. on 2005 Chrysler 300

I was driving on the exspressway and the my car started to slow down and would only go 40mph. I can still drive, everthing seems okay, it just wouldn't go over 40mph.

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1 answer
scan for codes and live data on post results. could be plugged exh low fuel pressure.