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Why does my gas wall furnace have a big flash of fire and then whoosh?

I just replaced our gas valve (white/rogers universal combination gas valve 36c03) and the thermpile/pilot burner. Since the replacement of new parts when the burners are being lit there's a big whoosh sound and then a huge like fire flash and the house rattles. I'm very converned, I know it has to do with the build-up of gas before the actual burners igniting, but I don't want to start fooling with the adjustment screws and such until I get an experts opinion. The pilot flame I believe is up too high because compared to what it looked like before, the flame is alot larger and is sputtering and the pilot is much more engolfed. Where as before it was a small blue flame just surrounding the thermopile tip. Please help asap as I'm worried it might be a dangerous situation and it's a ticking time bomb.

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