I am looking to buy a used silverado with 5.3L with active fuel management but have found many dealers don't advertise whether the vehicles have it or not. My father recently purchased a new 2009 silverado thinking just because it had the 5.3 it would have AFM but was disappointed when it was delivered and didn't. It is a real pain to call many of the dealers with used vehicles ask them and most of the time they have no clue or would just lie to get me to come in. Short of opening the hood, is there something in the VIN or somewhere else on a truck that would indicate it has AFM? Is there somewhere under the hood that states it has AFM if I am able to?