When I bought this dryer ,owner said it worked good and said that he thought he had it changed to lp gas. I hooked it up to natural gas. It dries clothes but has a sputtering sound. Where can a natural gas kit for my model be found? Is there a video of this change to natural gas for my model? Thank you.

Depending on the brand and model, you may not be able to convert. Many manufacturers don't want you fooling around with gas control valves. Contact the manufacturer and see if they offer a conversion.