A Fox Miracle plug will work very well too. Question; does the plug (the bad one) draw any current at all? Can you see a glow when you attach the igniter to the plug? If so, you could have some contaminated fuel that is coating the element in the plug so that no catalytic action is taking place. As you probably know, it is the catalytic action between the elements that coat the coil in the glow plug and the alcohol that keeps your engine running after removing the igniter. If you see no glow (no current being drawn) when you attach the igniter, then the probable lean run is truly burning the elements out of the glow plug.