Trouble with an LG dryer model DLG2526W

[AWSHandy]

The burner for this dryer does not seem to stay on long enough to dry the clothes.  I already replaced the thermistor.  It did not help. What next?  If it were an American brand I would replace the coils, but this one does not have that type of gas valve coils.  Hi limit thermostat?  Thanks in advance for the help.

[THRAMICH]

1 hour ago, AWSHandy said:

The burner for this dryer does not seem to stay on long enough to dry the clothes.  I already replaced the thermistor.  It did not help. What next?  If it were an American brand I would replace the coils, but this one does not have that type of gas valve coils.  Hi limit thermostat?  Thanks in advance for the help.

What is your exhaust temperature measuring? I don't recommend throwing parts at it until you fix it, better to test voltage under load to find where it is dropping. 

[16345Ed]

Gas dryer goes out early could be a clogged exhaust or too long of an exhaust run or too many elbows. LGs are very particular about airflow. 

[AWSHandy]

Ok. The exhaust ducting was clogged. 8nstalked new. Completely free and clear now. Now it will not heat at all. Burner will not light. I cannot see if ignitor is glowing. No peephole. I can tell there is no gas igniting. I tested the ignitor for resistance. It was at .469 ohms. Very high compared to a whirlpool ignitor at .104 ohms.  I tested the cycling thermostat and hi limit thermostat for continuity. Both checked ok. The gas coils are part of the gas valve assembly. I bought one. I will not install it unless I know that is the issue. I cannot return it if I install it. Am waiting on a new ignitor. Question...what else to check that would prevent voltage to the ignitor, thus open the gas valve?  Am stuck.  Any help appreciated.

[16345Ed]

You have opened the unit so you should have found tech sheet. There are instructions on testing your gas valve. 
 

also you can view the ignitor glowing with the top off the unit and looking down the right side.