[RobertSince1963]

Was taking too long to dry clothes. I cleaned out lint from inside the trap as well as the exhaust hose, then left the hose off to dry a load.

The igniter glowed on, lit and then cycled off. As I watched, the igniter continued to cycle on and glow to its brightest but no gas and it would click and go off and then continue in that mode until the time was up.
Thanks.

[SublimeMasterJW]

The heat is regulated with a Klixon mounted next to the blower housing near the vent pipe so it can judge the temperature of the air coming out of the drum.Right next to it is a melting type fuse. If the dryer runs and gets too hot the fuse will melt.But the dryer will still run. So if the fuse is good(continuity) and the dryer control(cycle) thermostat is also good then you should have power going to the gas valve assembly when the machine is running unless the timer is in the no heat or wrinkle free/cool down mode. When the gas valve assembly is energized the flame sensor

flame sensor

mounted outside the burner chamber detects the heat from the ignitor. When the heat is very intense then the sensor shuts down the ignitor

Ignitor

and that frees up the power so that the coils can be fully energised and open the gas gates. The gas comes out and hits the red hot igniter and you have ignition. It stays on for maybe 2 or 3 minutes or until the control thermostat is satisfied and shuts down power to the gas valve assembly. So...
If your gas dryer has a good flame sensor and a good igniter AND the dryer will work some and quit, replace these:

Gas operator coils
part# 279834

The coils get hot and quit on these machines when they get a little age on them. It is aggrevating because it is a hard to diagnose thing. But well worth the 20 bucks.

[RobertSince1963]

That's a lot of good information. Thank you very much! The dryer is 27 years old but now isn't the best time to get a new one.