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If you have a MAP sensor, I'd say you have a vaccum leak or a pressure/vaccum issues caused by messing with the PCV valve.
There's also the possibility your new EGR valve isn't working, killing your partial-load FE. If it was stuck open, you'd still have your idle issues. The valve could be fine but the EGR passes could be clogged with carbon.
And, finally...your oxygen sensor could have simply gone bad around the same time. Or, I suppose, a cracked exhaust manifold, sucking in air. I'd think this would turn up on your fuel trim, though.
And it could be something else entirely! Don't you love diagnosing things?
(I'd put the old EGR valve back on and see what happens. Then try the PCV valve, if there was no change)
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