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!