My 96 F350 prime mover has been spitting and bucking, or just plain
being gutless when cold the past couple days.  The rotor and cap needed
replacing, so I did that, suspecting crossfire.  Didn't do the trick at all.
   I got a chance to look it over again today and found that the PCV elbow
under the FI intake plenum had come out of the grommet.  No amount of safe
persuasion (would be even worse if I broke it trying to wedge it back in!)
would convince it to stay, so I jammed a stub of heater hose on top of it to
see if it would stay put.  While I hold my breathe hoping that does the
trick and cures the symptom, (I need to get a long allen wrench for that
mother of a bolt to pull the plenum off and find some time) and replace it,
and was wondering what sort of failure mode I can expect when I get there
later.  Would the valve spud that goes inside the grommet be broken off,
thus making sure I have to pull the valve cover, or is there something
simpler to deal with.
   Clues?

   Thanks!