I have a 1993 F150 5.0 auto that is running rich, it idles fine but at low speeds it will start to miss and spew black smoke.

I can stop and rev the motor and get it to clear out in about 20 seconds.

I have changed the O2 sensor, MAP sensor, IAT sensor, Fuel pressure regulator, and removed the Cat. also New Plugs and Air filter. and sprayed all vaccum lines with carb cleaner (no leaks found).

Has Anyone had similar problems?

 

Get an EGR simulator off ebay for $20 and plug it in and disconnect the egr. That solved that problem on my stang