2000 GMC Sierra 1500 5.3l v8 — What would cause a P0420 and P0430 code at same time after changing out my PCV Valve I originally had a code for a bad PCV Valve changed that out fixed the code about 50 miles I get a check engine light on for the P0420 and P0430 codes never had these codes before until changing my PCV Valve I’ll erase codes, but they come back once engine is warmed up to temperature truck idles slightly rough in gear and when parked idles in and out slightly need help notice somewhat loss of power around 40-45 mph then gain power back and is fine.