I am having rough idle too, but it is just that; only at idle. Power seems a little less. I was thinking I didn't get my cork mani gaskets completely tightened when I installed the DCAI. The rough idle didn't start until about 500 miles after the new gaskets were installed, not right away. I am having a boost sensor installed next week and will replace the mani gaskets again, this time coating them with copper gasket sealer and using a torque wrench. If that doesn't fix it then try CPS?