My Car is smoking smoke if I drive car around 50MPH speed? on 2001 Toyota Corolla

Few weeks back there was engine check light, I did Engine Tune UP, Changed Air filter and PCV cap, 1 Ignition coil is also changed. NOw last 2 days almost black smoke is coming out of if I drive above 50 MPH speed. What coudl be reason and what I shoudl do now. Can I ignore this issue little while...

Asked by for the 2001 Toyota Corolla
what was the code you had,post so we can adv.sounds like car is running very rich. scan codes again