My cars been blowing a puff of black smoke on acceleration, and i was wondering where to start on what could be causing this?

Fuel economy is still good (14l/100 city) but im sick of seeing the smoke behind my car..

its a 95 ghia running an au motor (ef manifolds..)

Have you replaced your oxy sensor before? they can become faulty and stuff your a/f ratio around.

yeh it came with my extractors but they were second hand so i might put my old one in to see if any changes..