rc helicopter , why does my helicopters turn off if i pull the glow plug?

i got a nexus 30 from kiosho , it used to fly ok but then i stopped using it , now i try to fly it again and when i start it if i pull off the glow plug it shuts off right away , does anybody now why?

Do you mean your glow driver? If removing the glow driver shuts off your engine immediately you most likely have a bad glow plug. To check it,
remove the glow plug and insert it into the glow driver. If it glows, it's fine;
if it doesn't, it's dead and needs replacing. You should have several glow plugs in case of situations like this. Glow wrenches usually have spaces
to store them (since going electric I've eliminated that problem).