Do most stock ka 240s run extremely rich?

my car runs uber rich, if I’m sitting at idle tap the throttle a bit… the car will puff out a bit of black smoke (not oil) the car doesn’t burn a drop of oil. I know when my exhaust was haggard, and I would give it some throttle the car would stink of fuel inside…

I just noticed it on the weekend, watching the car in a building window, everytime I tapped the throttle it would slightly stutter and puff some black smoke… still runs fine, pulls hard, and never stalls… just kinda hiccups if you tap the throttle quickly (to rev match and what not)

any ideas?

Change all tune up related items, they do run a little rich from the get go. My car got better mileage when i replaced the o2 sensor. Also clean iacv to stop hiccup in rev, most likely to be issue.