I will say PCM do go bad - I do not like to condemn them till all testing is done.. And helping on the net is working blind and deaf.
The p0300 a common misfire code - a misfire is 1)ignition,2) fuel, 3) mechanical.
It is the 1-2-3 testing needed no magic dart to pinpoint it.
P0442 is a EVAP leak small - called the gas cap leaks as that is a place to start.
Ideally a 'smoke' test is used to locate the leak.
A thought - Might want to check purge valve, leaking (vacuum when closed) would cause other issues... MAF and maybe a lean misfire...
Why are you looking at EGR? Is there more codes?
REreading your post - the pump wiring shorted BLK to BLK/WHT - your fuel gauge OK?
What is status of p0300 and p0442? Any new codes?
- So far as condemning PCM I can not see a reason, I only see the few posts.
Can you see live data - that would really help with the big picture.
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