2003 2500 Hemi 5.7 check engine light said, vacuum issue. Sometimes when I fill up the tank. It will go out. I replaced the gas cap and that didn't fix it. Any idea's?

 

Give us some additional information. What code came up? Do you have any driveability issues? Was the replacement gas cap oem?

 

Take it to an autozone or whatever parts store you have in your area that will pull your code for free and that will help determine what needs to be done to fix it. The check engine light could be so many things, so until we see a code, we have no way of knowing how to help.

 

Yep, what he said