Product review (5 stars): Fixed my problem!
I have a White-Westinghouse gas dryer from 1991 and it was having issues. It would fire up initially to warm up the dryer, then the fire would go out like it's supposed to but it would not come back on. The fire was all orange, too -- not blue like you would expect. I would hear a high pitched chattering sound while the fire was supposed to be on after that. I really thought I was screwed and would have to buy a $400 dryer. So I took the inspection cover off after I did some research and learned that the chattering was coming from my gas valve and that the coils were not actuating the valve properly. So I figured, "For $8.89, I might as well give it a shot." Fixed it immediately and it was so easy to do. Just look it up on YouTube. You have to unscrew 2 screws and unplug the wires from the coils and that's literally it. Installation is the reverse of the removal. This was so easy and I would recommend this to anyone having a similar issue to me, as these coils are all pretty standardized across most gas dryers.

I would also recommend cleaning out your vent while you are doing dryer maintenance. I did mine the easy way. I just shoved a leaf blower in my vent that goes into the wall, sealed it with a rag, and cranked it on. My yard was full of lint but there is much more air coming through the vent now. My dryer used to get hot to the touch on the outside and dryers are not supposed to be hot to the touch. Now it's barely warm because the heat is going outside the house through the vent like it's supposed to. It lowers the risk of fire as well.

Money is hard to come by these days but this is such a cheap and simple solution that I couldn't recommend it enough. My wife and I are so happy this worked. My dryer works better than ever. 10/10 would recommend.