Is it most noticeable on startup or shut down?
You can buy gas leak detector, don't use soap, and put it on all the fittings. If bubbles form there's a leak there. If not, you could see if you can get an HVAC tech with a gas sniffer and an electronic combustion analyzer to check it out.
Not to minimize the importance at all, it should definitely be investigated, but we semi regularly get a call where someone walks by their furnace vent and catches a whiff of gas. Usually it's on startup or shut down and it shouldn't happen often. OTOH propane is pretty stinky and it's pretty easy to get a faint odor. Good luck with it.
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