I just replaced the inducer blower and ignitor switch on our Trane model YCC. We turned the furnace back on to test it and the pilot light comes on and lights the fire. However, the fire quickly goes out and the pilot light then tries to do it's job again by starting the fire and it again goes out. When we further investigated it looks like one of the little fire retardant pieces that is in the tubes beneath where the inducer motor is mounted is gone. We believe this is what is causing our fire to not stay on. If that little piece of fire retardant material has blown to the back of the tube maybe it's possible that it is clogging the way for the fire to breath. I guess my question is does this sound like the problem and what is that part so that I can order it?