furnace gas burner noises and flame going on and off pulsating

bought this furnace on ebay, it doesn't get hot enough to melt copper and it makes pulsating noises, so i go through the process of figuring it out why and making a Frost T burner as a replacement. And figuring things out with it.

Видео furnace gas burner noises and flame going on and off pulsating канала mikesproject