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doesn't the manifold pressure sensor control mixture at other than idle rpm and the pot on the brain control mixture at idle? i kind of went thru the same emissions problem as you have. had to have an emissions certified shop work on car since $ spent go towards exemption, etc, etc. anyway, emissions went down alot after a valve adjustment (i rebuilt the top end and thought i had adjusted the valves per spec) then they adjusted the MPS.
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