I never had a rough idle on my 2012 Automatic V6 "BU"
I did have the clunk once in a while. From what I was always told was that the sometimes play in the two piece driveshaft is the culprit.
At times it will clunk when your slowing down at a light and the light turns green and you accelerate."CLUNK"
I put on the aluminum driveshaft and it totally went away. No more "CLUNK" at any time. It is just a little annoying but does not harm anything.
You will notice it does not do it every single time but only when it wants to "CLUNK"
Annoying but harmless.
The rough idle could be anything, Crap gas, Air Conditioning compressor on,
Does it idle rough every time you are sitting at a light or stopped???
2012-candy red- V-6 MCA, Automatic Trans. CFM Valve cover breather. MMD blackTail light trim.Magnaflow axle back street mufflers, JLT oil catch can.MMD hood struts.
Airaid Cold Air intake. red caliper covers, 3.7L performance engine cover, Flat black hood spears.Boss 302 strut brace, CDC rear panel, Trunk Cargo net,--Dash carpet cover,
Viser stickers to cover ugly yellow warning crap,Aluminum driveshafft and Swarr Bar.