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The heater blend door is vacuum actuated. You have a vacuum leak somewhere.
No the can go faster downhill or uphill
It requires extra power to go uphill, against the pull of gravity.
It can be a vacuum problem. Check to see if there is vacuum going into the cab. Check for a pinched hose or one that is soft and collapsed.
downshift
You have a vacuum leak .
noo
gravity!
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Gravity.
Engine is in need of tuning.
A Ford Ranger may die going uphill due to ignition problems. There could also be a problem with the fuel injection or fuel pump.