Report "Carrier Weather Maker XS. Changed pilot igniter assembly. Now pilot lights, main burner lights and will run for a minute or two then shuts off and blower kicks on for a bit. Blower stops and start-up sequence begins a second time. This time after burner ignition gas valve begins to modulated open and closed with the relay on top "clicking." Flame constantly goes in and out. Any thoughts would be appreciated. Thank you"