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Run a compression test to verify the condition of the engine.
Black smoke is caused by excessive fuel in the engine
you have a cylinder misfire
if it idles rough too, check your plugs, if not, check your fuel filter.
NAPA and Precision Tune and Auto Zone have a free analyzer check. Use it.
either your plug or plug lead is faulty replace both
The coil might be bad ,,like it was in mine
To much oil in an engine can cause it to flood which will then lead to blowing seals. But it should not effect how the car idles.
A 350 engine will idle good but cut out and run rough while driving if there is a vacuum leak. This causes too much air to enter the engine under load.
It's still under warranty, take it to the dodge dealer.
crankshaft sensor going.
If there are no CEL codes, disconnect the battery for a few hours and then re-connect.