Propane smell

I can smell propane slight odor, It is coming from the furnace vent outside

Some furnace's are placed under the stove. Is yours?

If so check all the knobs on your stove. Albiet propane seeks the lowest level it still can be pulled up thru the vent too. Either way check the stove knobs!

I have had them get bumped into the on position more times than I care to admit.