Well, replaced the MAF, after a few days without my friend the check engine light, there it goes again, pulled codes, p1136,p1138, p0455. the evap code once again set off, already have replaced the gas cap recently, and i assure you i make sure its on tight every time i fill up. any ideas?

 

Have you checked your vacuum hoses? I would suggest replacing them all.

The gas cap may have not been the problem, you may need to change the seal too.

 

make sure you check the check vavle under the manifold that comes from the gas tank vapor return