I have a Maytag gas dryer, model number DG9800.
When turned on the tumbler will rotate, the flame will ignite for about ten seconds, go out for a minute, then reignite. The high limit thermostat is what opens and closes the gas valve.
The vent line is clear.
It takes a LONG time to dry a load of laundry in this condition.
All other electrical components in that portion of the circuit seem fine. The ingniter glows, the radiant sensor opens to allow the gas valve to open, the valve coils have an ohm value, the cycling thermostat is closed. I have replaced the high limit thermostat, the same condition persists.
The flame has a lot of yellow in it and is very ragged. I can adjust slightly the amount of yellow in the flame by adjusting the air inlet at the base of the burner, the burn time can be varied between 7 to 12 seconds in this manner (instead of the usual ten).
When I jumper out the high limit thermostat, the dryer runs normally. All that is left as far as I can see is the valve itself. Does the gas valve also serve as a pressure regulating device?
Any other ideas?

>When I jumper out the high limit thermostat, the dryer runs normally<

Replace the high limit thermstat then.

I have replaced the high limit thermostat, the same condition persists.

When the high limit is removed from the area of the flame, but still left in the circuit, it runs.