63k miles and No maintenance?? Ouch.
You need to replace the following (Yeah, I know you've done some of them already):
-Transmission fluid ( http://www.lesabret.com/phpBB/viewtopic.php?t=2945
-PCV valve ( http://www.lesabret.com/phpBB/viewto...&highlight=pcv
-Air filter (NEVER use Fram)
-plugs (ALWAYS use AC DELCO)
-wires (spend more than $20)
-fuel filter (should be done every 15k miles)
-oil (hopefully thats been kept up with...)
-check brakes, replace brake fluid (every two years)
-radiator flush and fill (every two years)
-clean the injectors (Lucas or Chevron Techron in fuel)
-Clean the intake and IAC ( http://www.lesabret.com/phpBB/viewtopic.php?t=4054
After that is all said and done, THEN see how the car will run
As far as the PCV goes, you have the right part. To locate it, you need to stand on the passenger side of the engine bay, remove the plastic cover, look under the right side of the fuel rail (firewall side of the motor), push aside the spark plug wires and wire harness for the injectors (I think thats what it is, I believe its white) and look down. You should see the "L" part of the valve inside a rubber grommet and the larger part of the valve in the body of the upper intake manifold. Its a bit tricky to get out, but check the link I posted above and it should help ya out.
...oh... and does anybody care if I link to LeSabreT articles and write-ups? Its my home forum and I know where all the links are to common problems and what-not. I figure if the information is helpful, then it doesn't matter what the source is