Somebody cleared my codes without repairing the problem what can I do to get the codes to come back up

What is your question?

My car‘s been using a lot of gas and running kinda rough and I had somebody hook the thing up to see what codes it was throwing and they cleared my codes without fixing the problem. What can I do to get the codes to come back up Spark plugs have been changed and a new air filter

What makes this problem better or worse?

All the time

How long has your 2010 Chevrolet Cobalt had this problem?

Couple months