I worked at a service station some time ago and we found that steel wheels would rust and the air would leak out through the rust.
If that is the case a good tire shop will take the tire off, grind off the rust and then use some goop that helps seal the tire to the wheel.
This would be a good time to replace the stems if they are more than a couple of years old.
Make sure they balance them. Mark which side is which so you can rotate them when you put them back on.
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