If the filters aren't fairly recent, they could be changed.
In the current weather, you may have some fuel freezing issues if there is moisture in the diesel. Before you change the filters, I suggest you add some diesel fuel supplement.
If you have not added anything like this, prior to winter, head to Cdn Tire and get some some
Power Service Diesel Fuel supplement. This will eliminate any water in the fuel.
Also not a bad idea to pick up some Diesel911, same container but red, and keep it in the trunk. This will liquefy frozen diesel in about half an hour, in an emergency (but only use it in emergency, as it contains alcohol).
Check that all the hose clamps on your fuel hoses are tight, and don't forget the very short hose between the clear filter and the lift pump housing. I had a fuel freezup last January and it turned out that was loose enough to let in air.
If you have a serious air leak, the car may 'grunt' or 'puff' at idle.