Rough idle hesitation

What is your question?

I had the po401 code pop up I cleaned out the hole where the EGR exhaust enters and exits changed the EGR valve then I got another code po305 and the po401 went out I changed the spark plug and wire hoping that was the problem still no luck trying to figure out my issue also checked the coil packs by removing the plug wires they all had a spark I use my car for work and I haven't been able to work due to the issue please help

How long has your 2006 Chevrolet Malibu had this problem?

The tissue just occurred after I cleaned out all the carbon and replaced the EGR valve on Saturday the 30th of March 2019 not even a week