Bryant Quietline central unit (easily 40 years old but still 'works.') What has been happening recently is the burners will kick on and stay lit for about 2 minutes. The burners will kick on - the fan will start shortly after - the burner will run for about another minute and then shut off while the fan runs for about another 3 or 4 minutes.
This will repeat about ever 10 minutes.
A/C works - just this heating issue.