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.

Asked by for the 2005 Chrysler 300
1 answer
scan for codes and live data on post results. could be plugged exh low fuel pressure.