stalling engine on 2003 Buick Century

My car keeps stalling while I'm driving, and when I start it again a big cloud of black smoke comes out of the exhaust. Any ideas?

Asked by for the 2003 Buick Century
Sounds like the engine is running rich. This can be caused by many things. Iss the check engine light on?
Yes, the check engine light is on. What do you mean by "the engine is running thick"?
The engine is running "Rich". This means that is is using too much fuel, and that is why you see black smoke from the exhaust.
If the check engine light is on, then the engine computer has registered a fault in the fuel injection system and has stored some information about the fault. This information needs to be retrieved, and it will be in the form of a diagnostic trouble code. There is a set of diagnostic instructions along with each code (there are hundreds of codes) and these instructions need to be followed to find the cause of the problem.
Continuing to drive the car like this can damage the catalytic converter, so get it checked very soon!
Good Luck!
Well thank you very much, I made an appointment for it for Thursday!! You were very helpful
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