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MIL P0401 EGR Flow Error but no failure found

(2001 Toyota Camry)
in Newport Beach, CA on August 09, 2010
Cleaned EGR Valve pintle and verified the diafram opens and seems to modulate at higher rpm and/or temp. Code is almost always active, but sometimes cleared for 20+ tests. Once in a while usually when gas low and very hot outside get P0446 Vapor Emissions. How do I fix and pass Ca Smog test????
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