Welcome to the forum.
That code is an indication of misfire, likely due to a problem with plugs, HT wires or ignition coils.
What spark plugs did you install?
It's best to use regular plugs (not fixed gap plugs etc.) gapped at 0.75mm (0.030").
A bad PCV will more likely cause rough running and possibly lean mixture error code.
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2000 KIA sportage pcv and code po304
Linear Mode
