Z32 running rich and vibrating

[trandana]

Hey guys my z32 tt has been sitting outside for a while and it's started to get a bit cold here (-10C) and the other day I started it up for the first time in a month when it was +5C and it began vibrating like crazy, the air fuel ratio gauge was reading at 10 which is the lowest setting ( I imagine it was even worse than 10) and black smoke came from the exhaust and it sputtered a bit and died. Even if i just turn the key to on without starting the car it vibrates like crazy. I think this is the first time the car has ever seen this kind of weather so it's probably a bit strenuous for a 25 year old car.

Any ideas of what this is caused by?
Thanks in advance:)

[nissanfreak12]

Check your injectors. Its possible one is stuck open which will cause the black smoke. See what the ohms are and report back.

What do you mean by just turning the car to on without starting it? Is it running or not running?

[trandana]

thanks for the reply!
I mean when I just turn the key to the on position (not start) and engine is off the whole car vibrates like crazy. Then it does the same thing when I actually start the car and the engine is running, plus black smoke and running really rough plus low air/fuel ratio.