18 yr old Maytag gas dryer wouldn't dry clothes. Igniter would power on, gas valve would open and flame would start but within 30 seconds, flame would go out and cycle would repeat continuously. Replaced gas valve solenoids and igniter (while I'm in there). Started dryer up, same exact problem! Thermal cutout on flame box was opening (getting too hot so not enough airflow/ this is what clued me in to the problem). Checked and cleaned lint from all airflow passages in dryer. Still same problem. Went outside and checked (newish) dryer vent outlet and it was completely blocked! I'm not new to repairing appliances either which is the embarrassing part of this but, hey, sometimes you gotta laugh at your own stupidity! ALWAYS check the simplest things first or it can come back to bite you! Usually by misdiagnosis and having to do more work than necessary to solve the problem. Anyway, no sense in removing new parts now that they have been replaced. As always though, I found and fixed the problem and got there as efficiently as I was able to. Appliance Parts Pros are great! I have ordered parts from them before and they are accurate, inexpensive and timely and sell oem parts. Great resource! Thanks