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This is a little late I guess, but anyway.
The conversion process from natural to LP involves a few things. The appliance regulator has to be changed over first cause lp runs on higher pressures than natural because of it's settling tendencies, where as natural just floats up into place, propane has to be pushed harder. Because of this and other characteristic differences the orifices have to be changed. The Lp orifices will be smaller than the natural. Orifices come in many styles, some have spud type orifices that must be changed or respuded, and some have adjustable orifices. This is most commonly seen in ovens and broilers. If these orifices are not changed/adjusted then you will have way way way more gas than needed. Usually fire can be seen blowing up into the oven by the side vents in the bottom drip pan. Because there is so much gas there is no way to get enough air to complete the burn, so a yellow nasty flame is produced which produces soot and a lot of it, CO, as well as other nasty poisonious gasses. Then if everything but the regulator is changed you get the opposite, not enough gas and too much air which still leads to an incomplete burn which puts off the same gasses but not the soot, as well as a lazy flame. If you ever buy another gas appliance read the instructions! If a conersion kit is included with the range the owners manual will have conversion steps included, if the kit is not included the manual will tell you to get one which will include instructions for installation. Honestly your range is probably close to ruined now from all the soot damage and if not, it's in desperate need of a thourough cleaning which is almost impossible in todays ranges.
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