You don't. The ECM controls the idle speed. If you are having idle problems, you may have a vacuum leak and you probably have a "check engine" light illuminated also.
You don't, it is done by the ECM (Engine Control Module).
Idle Air Control Valve
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No it does not.
There is no adjustment to my knowledge.
R134a
Probably the 700R4
It should be, yes.
R134a
4500 lbs +
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Could be in need of a tune up Could have a vacuum leak