The PCV valve is internal and shouldn't need to be replaced. The fuel filter is located at the rear of the car. It is by the fuel tank and rear axle.
The DOHC 16 valve engine uses a Fram PH3387A The base 8 valve 2.2 engine uses Fram PH3506
to the left of the oil filter at the rear of the engine (97 Cavalier)
Right below the EGR valve bolted to the transmission.
Replace the fuel filter, that is a good place to start.
You have to take off the air filter and the starter has like two bolts holdin it in
what are the signs for replacing the oil gasket in a 1996 Chevy cavalier
if the motor is a 2.0 or 2.2 the filter will be on the backside of the motor mid-passenger side purolator filter #10111 fram filter #ph47 Lider
Chances are it is. You look under the hood. If there is 1 valve cover it is an L-4
in front of the passanger side rear wheel On the non Z24 1996 Cavalier it is located directly behind the gas tank in front of the spare tire well.
where is 1996 cavalier convenience center
Instructions on how to change the rear hub wheel bearings on a 1996 Chevy cavalier