Gas dryer would only occasionally heat up.

I noticed that the igniter would glow white hot for about 5 to 10 seconds, but would only ignite every once in a while. I decided that it was probably the gas valve that was bad. I removed the wires to the igniter and valve, and removed the two screws that secured the valve to the frame. I accidentally bumped the igniter as I removed the valve from the dryer - it broke! The igniter is extremely delicate, be careful not to touch it. When the new valve and igniter came in, I swapped some of the mounting hardware and installed the valve and igniter. I reattached the wires. The dryer fired up immediately - it was an easy fix.