What exactly are you looking for?, the 91 v6 fbodies had the 3.1L mpfi and the earlier ones were 2.8l, Are you looking for the mass air flow sensor? i assume not since 91 didnt have those either, they used the same speed density computers as the 90-92 tpi cars. If you are looking for the actual intake manifold and plenum setup, someone should have one off a car they parted out, i just sold a complete running '91 3.1 engine, and i'm not sure when i'll get another, may be a few months.
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