My york diamond 80 gas furnace has trouble with its running properly to produce heat. It will fire up,to run, makes a clicking noice then flames ouy

This is really a question for the HVAC forum: https://www.askmehelpdesk.com/heating-air-conditioning/

Does it fire up the pilot and then burners? If so and it don't stay on is your fan motor engaging? If not try turning the fan to on at t-stat and then start it. If this makes it work it is the cam stat/limit switch. These are adjustable. I would set at 90f and 120f. But they do go out as well.