What causes black smoke to come from exhaust. on 2004 Chrysler 300M

Hard starting, rough idle, smell gas fumes and black smoke inside the tailpipes....

Asked by for the 2004 Chrysler 300M
The engine is running too rich (getting too much fuel). This is a sign of a pretty big issue that needs to be checked out by a shop that can diagnose this fuel injection control system.
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