Scott,

I've used the emergency shut down procedure on a couple of occassions some for practice and others for those moments of panic as my bird rolls off the end of the runway into the funk!!

however, after a thorough inspection of the intake area of my airplane my engines have never failed to restart. I've never found the need to replace the plugs on any of my engines ( knock on wood, I guess ).

I'm not one of those 50 lb head guys that could probably compute the thermal shock effect on the engine during the rapid shut down, so my guess is you were a recipient of the Old Gus Grissom syndrome. "it just blew"

any of you smart guys have any better ideas?

sorry, I'm not much help here Scott but I've been very fortunate with all aspects of engine operations.

replace the plug and fire it up. if you had had grass down the intakes perhaps you ingested some fod that may have knocked the coils loose but I doubt it. I've seen Eddie Weeks DC-10 doing engine run ups in the grass at Superman. The engines swallow that stuff and keep on going.

good luck,
buck