what would make the furnace stall on lighting is the glow piece to far away or what

ok dose any one else know why its stalls on lieing it did it all last winter the winter b4 that worked fine so dose something need cleaned adjusted or replaced

Coleman dgaa090bdta we lost the book on it i know the piece glows in side i can see it threw the window..... it acts like it fills up with gas b4 it lite and makes a small boom what part would i need or what can i do to fix this......