Had to replace the camshafts about 10,000 ago. Vehicle is now having what sounds like lifter clattering. Engine is operating rough when gas is applied. I’ve seen a lot of recalls on 6.2 motors and don’t want my engine to die if it can be helped. I’ve taken the vehicle to my mechanic several times and he thinks it’s the lifters or something more serious. Hopefully the connecting rods aren’t the issue