I recently determined the cause of the smoke at idle, at least for my speed3. I've got a mechanic buddy here in SoCal who helped me accomplish a leak down test to determine whether it was the turbo seals or a bad ring. Unfortunately, cylinder 3 failed, I now have to get that ring replaced.
So I've been experiencing this rough idle issue ever since the weather began to cool down here in CA. My 2012 speed3 with stage 2 bolt ons has been throwing the p2006 code for a while, but never resulted in this goofy idle. Now it throws the p2006 code and the p0300 code, even though I've...