20Silverado13

Sorry im late to the topic but i have an 08 Impala SS that does the same thing. Stabiltrac and Traction Control light came on along with the Cyl. 4 misfire code. I replaced the lifter twice along with the VLOM and deleted the AFM in HPTuners. I have found that if the #4 lifter has already started to fail before showing any problems it will cause the Camshaft lobe for that lifter to begin to flatten. This is because the valve lifter oil manifold is faulty and spin the lifter 180 degree(Lifter will be spun around). This causes the camshaft lobe to flatten. I also think that the lifter trays has something to do with this as well but I cant remember but I would replace those as well. If you can, pull the cam out and see if any lobes are flat and if not make sure you soak the AFM lifters in 5w30 oil before reinstalling. Hope my response helps