Product review (5 stars): Solved Delayed Ignition "Boom" Problem
My symptom was that we would turn the oven on and 5 minutes later it would finally light with a big boom or whoomp sound.  At first it didn't seem bad but got worse and worse and downright scary.  Didn't know if this would fix it, but read replacing the igniter solves 90% of these types of problems, so for the low price and easy install just replace this first then diagnose elsewhere if it doesn't fix it.

This is the Norton 501A which substitutes for many Sears part numbers, for our Kenmore 665.75775890 it was 3186491.  Sears wanted over eighty bucks for this, got it here for a quarter that, ordered Saturday was here on Monday with Prime.  Was a couple bucks cheaper on an auction site, but knowing this is OEM and not some knockoff was great, actually comes in a real GE box.  I ordered direct from Amazon not a 3rd party seller on Amazon to be sure it would be OEM.

Install was a breeze, there is a short video on youtube which shows you exactly how to do it, just search youtube for WB2X9998.  Best of all it solved my problem, no more scary boom coming from my oven.