My first thought on this... get a professional to inspect your entire Propane system, regulator and the Stove. A flame that is yellow or sooty is also a symptom of other problems - and Carbon Monoxide is a big concern with a yellow or sooty flame.
Steve & Stacy with Jasper (shepherd)
2015 Seneca 36FK
Custom 27' flatbed trailer hauling our:
07 Toyota FJC & Yamaha Kodiak 400 ATV