 Remove the manifold from the vehicle. Then remove the lifter AFM manifold from underneath. Block off the oil passages inside of there and put it back on. Then there's no oil pressure going in because if you have a solenoid starting to leak on that and it starts to apply just a tiny amount of pressure to that, even if it's turned off, that little bit of pressure will open that latch just enough that it will slip off the side and break it.