Product review (5 stars): Problem with Oven warming up
My GE Profile oven was taking for ever to warm up and often required me to turn on the the stove top burners.  After a brief internet search, I found that it was most likely the igniter that was the problem. Like most people I thought it was the gas line, since I could see the igniter turning red.  I found that it is the igniter that "opens" the line and starts the flow of gas.

I found this part on several sites for about $75 plus shipping, which is what the do it yourselfers priced it at.  I found it here for under $25 including shipping and handling!  It took about 10 days to come in, but it was still in my hands by the promise date.

The whole thing took me less than 45 minutes to replace and I was extra careful.  A service call from my local repairman would have been atleast $150.  Plus it would have required me taking off time for work etc.  I would recommend this seller and product for anyone with this similar "common" problem.