my 90 z 3.1 wont idle when cold

[90cavy3.1]

can anybody tell me what this means i start the car runs great 4 about 10 secs then it sputters and eventualy stalls and i have very rich exhaust when it is doing that i changed the tps plugs and wires . o forgot to say when it gets warmed up its fine but revs 1.500rpms any ideas??? thanks

[andrewv]

map sensor or mass air sensor , most likely map sensor on fire wall