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I forgot to mention that sometimes after the car gets hot(preferably after a longish commute and stuck in traffic in swealtering heat) I can suddenly smell gas really heavily - as if something has opened and decided to dump gas. I am thinking purge line leaking/cracked/disconnected on top of the engine. I am plannign to drop my engine soon (as soon as the extra cold weather relents over the East Coast to just cold weather) and go through it for several tasks - hopefully I will see something then..
Eric, problem solved? Thanks! - Filip PS. I am doing research to tackle p0446 myself. I have no hard starting symptoms. I did notice lots of vacuum when opening gas tank cap at fillup time, defn more than normal. Thank you to all those that posted in this thread - very useful info! Attached please find a diag PDF I found in my research so far that someone else may find useful. REMOVED