There are supposed to be plastic caps on the bleeder valve.
They are sometimes discarded by unprofessional mechanics. Without the added protection, I have seen them get gummed up. A small stiff piece of wire, or a scratch awl inserted into the valve can clean them up enough to work...
I had this problem a while back.
I would bet it is your catalitic converters, O2 sensors, or a
combination of the two.
Drive it at night getting it up to operating temps.
Stop and get out and look at the converters.
If they are glowing red, they are restrictive causing the 02
sensors to...
Remove the cover on the vents for the foot area, stick your hand in it and you will feel the diverter door.
See if it moves when you change the controls.
I have seen these break off the little tabs that hold them in. The part is not expensive, but the whole dash needs to be removed to replace...
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