I was headed down to Augusta GA yesterday to see my dad on life support, not expected to make it through the night and in an instantaneous moment manifold pressure dropped from 30" to 11".  Called Chicago Center declaring an emergency and asked for lower and closest airport.  Kalamazoo was 20 miles ahead so chose it; good size airport with emergency services. After going through normal emergency procedures we tried assessing the problem. Nothing would raise the manifold pressure and I then notic