Product review (5 stars): Whirlpool 9758079 Oven Igniter for Range
My eleven year old Whirlpool range was not dependable in relighting the oven.  There were three things which could have been the problem.  In reading other reviews, I see others were of the same mind.  It could have been the electronic relay - very expensive, the gas valve - also expensive or the igniter.  Although I thought it probably was not the igniter, I found one offered by Amazon at a fraction of the cost of getting one from an appliance parts store or from Whirlpool.  I would like to know what it is that goes bad in an igniter, but as soon as I replaced it (simple process), we were back up an baking.  My wife thinks I am the GREATEST!