When we moved in, we noticed this specific "gas particulate" smell throughout the house whenever we'd use the stove. It wasn't leaking gas, but rather this smell I associated with dirty burning or something. The other times I've smelled it have been in propane space heaters for outdoors.
We replaced it with an induction range and have been completely happy with it. Heats amazingly fast, no burner to burn things, no emissions in the house, we love it. I never want to own another kind of range again.