ima say the butterfly let loose and/or something is in your combustion chamber.
+1 I would get a magnetic tool and fish around and see if it pulls anything up out of the cyclinder.
if it ran ok for 10 seconds and then died... thats enough time for it to bounce around and then get unlucky and come between the piston and plug.
and if its a piece of a screw, do a VICS removal. lol
thats the one... sorry, multitasking menial repetitive stuff at work FTL.Don't you mean VTCS?
scary