Bought my car had it serviced at mazda i/e motor mounts and the check engine light was on the kept it for about a week said it was a evap leak and told me they fixed it got home the light was back on took it to autozone they read it as evap leak car runs kinda rough because of this also have noise in the re end and rough starts

 

Gas cap or the evap hose.
Simple stuff.

 

https://www.rx8club.com/series-i-trouble-shooting-95/

 

Got 12.3 miles on the brand new gas cap(and a bettary unlup for reset) light is back on extremly rough start any suggestions

 

Check the evap hose on the upper intake manifold.....

Are you sure you don't have a vac leak It will run like crap if the hose is missing on the top of the manifold