P0401 Trouble Please Help Urgent!

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I have the dreaded code and have read every thread I could find on this. I
have already removed the intake and cleaned out all of the passages and
replaced all of the hoses. Next I replaced the EGR modulator, VSV and
EGR, as well as testing the temperature sensor trying to track it down.
Now I am at a loss, I hate throwing money at this thing, but now I don't
even know anyplace else to throw money at. The real bummer of this is
that I have to get it smogged so that I can renew my registration and I
can't get the darn check enginge light off. Please help!

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