Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 2010 GMC AFM lifter failelure. Replaced, still misfiring. › Reply To: 2010 GMC AFM lifter failelure. Replaced, still misfiring. April 18, 2020 at 3:04 am #954334 Richard KirshyParticipant Just asking… Did you check to make sure the valve was actually moving after the repair?