Problems with a Swap

ok heres the thing i have a 89 240sx and swaped a 91 kade in. but the car runs rich and i forgot where i read but they said the 02 sensor is supposed to be heated but when i tested the current on it there was nothing. and it idles like crap. i figure i wired it wrong but when i read up on the wiring it said it was just matching the wires. im just wondering ifyou guys had this problem and if you could help me out.

well first thing off the top of my head is replace the O2 sensor and see where that gets you.

well i have i put this in january