Car runnin Rich

I noticed earlier tonight my car was puttin out some black smoke.....and even when idling it was comin out the tailpipes....What could be causing this and how can I fix it???

The motor is a 5.0L 305 TBI

The most common cause is high fuel pressure caused by a failed fuel pressure regulator, or it has been disconnected from manifold vacuum.

where can you find the failed fuel pressure regulator?

Under the TPI plenum at the back on TPI equipped cars.

dang, would you happen to know where it is for a carbed car? im runnin a little rich too

I usually see bad or marginally bad O2 sensors, cause it too, especially TBI for some reason.(Like my truck for instance..)
Also check plugs and plug wires, distributor cap and rotor..weak ignition can cause it too..:)
Carbed car can be dirty air filter, needs tune up, idle mixture wrong(turn screws to get the highest idle speed, on feeback carb its an electric device like an IAC but for fuel), O2 if equiped..