Why will my 2003 Intreped NOT go over 30 MPH? on 2003 Dodge Intrepid

I also smell something burning. Not sure what it is.

Asked by for the 2003 Dodge Intrepid
Brake(s) stuck on? After driving a few minutes , stop and check all rims see if any are hotter than others....... Maybe fried converter (clogged/melted) , from running to rich? Need more details of conditions.
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is it shifting