1997 Dodge Avenger ES coupe 2.5l v6

Ok I own a 97 Dodge Avenger Es coupe
with a 2.5l v6 Automatic trans 164k miles
I just bought it and replaced the catalytic
converter because I realized it was
overheating at low rpms I got it checked
and it was half way clogged up so I
replaced it with new one. Ok so still over
heats at low rpm. So I replaced the
thermostat next which was burnt up and
sealed shut car seams a lot better no.
Check engine lights on, but still over heats
at low rpms. What should I do next???
This is one of 2 of my vehicles and I really
need to get it under control if you throw the
car into neutral and rev it to a higher rpm
for a quick second then it will go rite back
to normal temperature