I pulled the following codes from my cousins 97 Subaru Legacy
po304 Cylinder #4 engine misfire detected
po325 knock sensor circuit malfunction
po440 Evaporative Emission Control System malfunction
p1441 Fuel tank pressure control system - voltage high
The symptom was lack of power, especially going up hills.
After doing some research we found that po304 and po325 was caused by a bad knock sensor. When he replaced the knock sensor codes po304 and po325 went away.
As for po440 and p1441 i would replace the gas cap, first because it is the cheapest and most obvious repair. If the code returns then i would obviously look a little deeper and the gas cap can be a common culprit with these codes. I would hate to replace something expensive when the only problem was a bad gas cap.
I will try and give and update later about the last two emisions code
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