I have a 2004 City which is being used at home. Its an Automatic (CVT)

I drove it the other day and it feels extremely lethargic along with vibrations at idle issues.

I need to know a few things,

1. Where is the fuel filter located? Is it replaceable or is it inside the tank?
2. Does this model have a cat converter ? If yes, what does it look like ? The car is 130 something driven so i might just throw it out.
3. Does it have an O2 sensor ? I cannot see anything on the exhaust manifold

What else should i check ?

It cranks fine, almost wants to die if i turn on the AC and put it on D.