problem idling when cold

i have a 90 z24 3.1 and i was wondering if someone has seen this before .i start the car runs great 4 about 10 secs then it sputters and i have a verry rich exhaust i changed the (tps) new plugs wires... any ideas??

thanks

[quote=90cavy3.1]i have a 90 z24 3.1 and i was wondering if someone has seen this before .i start the car runs great 4 about 10 secs then it sputters and i have a verry rich exhaust i changed the (tps) new plugs wires... any ideas??

thanks o and i forgot when it gets warm runs 1,500rmps