Can anyone help me with a problem that im having with a 2009 silverado 5.3 no cylinder deactivation and flat top pistons. the problem that happens is when the truck is under heavy load from take off such as burning out. the truck goes into reduced engine power and the code it has is P0606 which is a pcm performance code. i have swapped the pcm and retuned but still does the same problem. anyone know what i can do to fix this?