Probably you're applying too much voltage to the plugs, measure it with a voltmeter you need to put between 1.6 and 2.0 volts to light correctly the glow plug.
Check if your plug driver has one screw with some kind of adjustment for the kind of plugs (Hotter - Colder). Adjust to hotter (less voltage).
[quote=MugenDrew;2684554]BATTERIES are for FLASH LIGHTS, gasoline is for cleanin parts, alcohol is for me to drink and well NITRO...everybody know thats for racing.[/quote] :D:D:D