2001 Saab 9-5 (V-6) just started running real rich, I am getting around 10 mpg.?

[jet6581]

I just got the car back from the dealership to correct this very problem. The dealrship installed a new throttlebody and said it was fixed. I later drove the car approx. 75 miles an the check engine light came-on. It then started emitting black smoke and smelled really rich. Now getting about 10 mpg. Vaccum problem, Electrical, Turbo????

Thanks
M.S.