I also have a '85, but with a slant six. I had to replace the carb. and air pump.
Sometimes it's more than just a carb. adjustment. Make sure all the emissions tubing is in good shape and not leaking. Make sure the air pump is not seized and that the belt that drives it is in good shape and not loose. There's also an emissions tube that runs down the catalytic converter....make sure it's solid and not rusted away.