If its till got the original EGR intake (not a bad piece...) make sure the EGR valve isn't part of the problem. Check the PCV valve.
If you have not had the intake off, it might be good to remove it, to verify the gaskets are not a problem...
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1977 Black Trans Am 180 HP Auto, essentially base model T/A.
I'm the original owner, purchased May 7, 1977.
Shut it off
Shut it off
Buddy, I just shut your Prius down... 
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