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This is a common problem on these you need to replace the igniter, even though it glows it's not drawing enough amps to open the valve fully immediately after it gets red hot so the valve may be partially opening and finally lights but you get a big ball of flame because the gas is leaking out of before reaching the igniter, therefore you get a big puff and lights, replace the igniter and that will take care your issue, here is a link where you can purchase the igniter if you wish to get it there. http://www.repairclinic.com/PartDetail/Hot-Surface-Glow-Bar-Igniter/3186491/503012?modelNumber=665.75775890 just because these igniter's glow and seem to glow bright they just are not drawing enough amps to open the valve, thanks and best wishes, Bryan