Product review (5 stars): Worked miracles on an old Amana
Our Amana AGS760WW range (from the early 80s) starting becoming slow to light and eventually just reeked of unlit gas.  Some online research revealed that the igniter heats up by was of resistance and the flow of current then triggers the gas valve to open.  A complete, but poorly performing ingniter would display my symptoms, so I sought out the right part.

When shopping on some appliance part website, my handy Amazon Google Chrome plug in displayed a message saying that Amazon had it, and sure enough they did (and at 40% of the price) and it was available with Prime shipping!  I never knew to look at Amazon.  The first igniter arrived on a sub zero day, well packed but was broke.  Having read other reviews I understood these to be highly brittle, and sure enough it was.  As noted it was very well packed, but the conditions were less than ideal.  A prompt replacement was dispatched, and it arrived intact.

I skooted the oven out, unplugged the power (left the gas line connected), and removed the door and racks.  The metal guard that shrouds the ignited was held in place by three easy to remove sheet metal screws, and the I pulled the old igniter out.  At first glance, it seems much bigger than what's in my oven, but much get's hidden behind the back wall.  It's an identical part.  I fished the wire nuts out via the smallish hole to unscrew the old unit.  I replaced the plastic ones with new ceramic wire nuts (rate for high temps, but the old ones should work).  Note these were not included with the replacement part, but likely weren't needed. Then I put everything back into place.  The hardest part was removing the metal guard from the old igniter and installing on the new one, especially while being fearful of it's brittle nature.  All in all, it took 20 minutes, including putting the door back on (which can be tricky).

Everything worked great, and the oven heats much faster than I've ever seen.  It must have been going bad these last few years.  I'm so glad I fixed this myself.