2 years ago I had the ignitor changed on my bryant furnace. For the last couple days the furnace still comes on and I can see the flames in it. It starts with warm air then gets cooler. Usually can not get the house warmer than 60-65 degrees. What could I Possibly check to repair it myself? I have already changed the thermostat 2 days ago. Could it possibly be the ignitor again?

Check your filter, this is the most common problem with furnaces.

Already changed the filter also.

The furnace should flash a code when it faults out to tell you what's wrong. Is your system a 90% or 80% furnace? (vented with pvc 90%, with metal and using a inducer motor 80%)

When the air gets cool see if unit is still firing,might be flame sensor needs cleaning or replacement.if flame sensor doesn't prove flame it will shut off gas flow.and blower will run,I don't think its ignitor problem,because you are getting warm air which means it is igniting...