I'd say replace the TPS (make sure you reset the computer again and tweak it to 0.995V), and borrow a friend's good-and-working MAF meter. I would think it'd have to be one of the two items.
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Capri306, Moderator, The Mustang Works Online
1979 Mercury Capri, 5.0L -- C4 -- 2.73
1987 Mustang LX Notch