91 skylark help

hi i just got my car running, while it is idleing there is black smoke coming out of the exhaust just litely enough to see, the motor is a 3300, thanks for any and all help, and does anybody know were i should look for a vaccum leak that keeps my air conditioner from working and it affects my speedometer

more than likely it's burning oil or there is a extremely rich air mixture so I would check that

more than likely it's burning oil or there is a extremely rich air mixture so I would check that

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