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
1 answer
what was the code you had,post so we can adv.sounds like car is running very rich. scan codes again