Gas Dryer not drying properly

[SIZE=3]Hello I am a newbe here and could use some help.[/SIZE]
[SIZE=3][/SIZE]
[SIZE=3]I have a Frigidaire gas dryer model GLGR331AS3. It is taking up to two hours to fully dry a load of laundry. The clothes are hot but just not drying properly. The igniter comes on and glows orange, the gas SOV clicks on and injects (propane), and the flame burns orange. I know the fame should be blue. The flame seems to be week however I never monitored the flame while dryer was operating correctly. [/SIZE]
[SIZE=3]Key indicator:[/SIZE]
[SIZE=3]I can change the three position {Low/Medium/High fabric selector switch setting without a change in flame intensity. [/SIZE]

[SIZE=3]I have also checked the following:[/SIZE]

[SIZE=3]1. Completely removed exhaust hose from dryer end checked for pluggage.[/SIZE]
[SIZE=3]2. Checked duct work rear of dryer for pluggage.[/SIZE]
[SIZE=3]3. Removed front of dryer and cleaned out blower fan and vacuumed out bottom of dryer.[/SIZE]
[SIZE=3]4. Checked exhaust outside of home to ensure good flow and no restrictions. [/SIZE]

I’m not sure what to do next. Thanks in advance.

I ran the dryer without the exhaust line hooked up last night. I put 4 pair of jeans in and set the dryer for high heat and 70 minutes. The jeans were still damp this morning.

No one has any ideas?