Getting codes 0446 0300 0404 ??

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bayareadude84

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My burby has been idling funny,Almost like a misfire.Took it to autozone and had it scanned for codes

It throws codes 0446, 0300, 0404

In the past 2 years I have done

New fuel pump
New fuel filter
New AC/DElco plugs and wires

It's a 2000 5.3 with 215K miles


Any idea where to start without throwing money at it like the Autozone guy recommend ??? :whymewhyme:

---------- Post added at 08:59 PM ---------- Previous post was at 07:43 PM ----------

Did some research,I have never messed with the EGR and PCV valves,I guess I can try there ??
 

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