So i've got these codes, need a little help. 98 30v 5sp manual
 

p0441 evap emission control sys. purge flow fault.

p0432 main cat below threshold bank 2

p0455 evap emissions control sys. leak large

any help deciphering is appreciated.
Btw car runs very well just got 26 mpg on a trip and routinely get 20-22 mixed city/hgwy driving . car has 158K on it.

Thanks

0441 and 0455 sound like a fuel cap problem.......

replaced the fuel cap a few weeks ago didnt get rid of the check engine light.

Bad purge valve?