I have a 1998 Cavalier the ETS OFF light comes on and the car dies, replaced fuel pump fuel filter fuel relay sensor carnk and can sensors ICM board mass airflow sensor nothing helps got any other ideas

Try replacing the spark plugs with the same ACDelco plugs that originally came in the car. Another possibility is a failing catalytic converter.

I did a complete tune with the original parts didn't help but may try the converter

Thanks