I have an 03 GMC Dmax with with 130k miles. I have an Edge chip, AEM intake, and 4" silverline exhaust. I noticed 20K miles ago or so that it would smoke a little if I was just idling for several minutes. After driving again, it would go away. In the last couple of weeks, the smoke seems to have gotten steadily more constant. I obviously can't be sure that it is smoking while traveling at highway speed, but it definitely is when I am traveling slowly and always when I am sitting still. I almost always leave my Edge setting on 1 and I changed the low boost fuel setting for the least smoke. I have not noticed any change. Any ideas what would be causing this constant smoke? I'm not worried so much about the smoke, but more that there might be something wrong or that this is a sign that something might go wrong. Thanks.