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on the intake
check the EGR valve they are known to be faulty
The idle control valve on a1999 Ford Expedition is on the upper part of the engine by the throttle body and fuel injection.
Heat control is by air flow control doors in the a/c and heater box. There is no water valve.
Did you ever find the location of the pcv valve?
When working on an engine it is important to have a diagram to help a person recognize the parts. A diagram for a Ford Tempo Engine is found in its manual.
remove it from the engine
It is located behind the bulkhead, accessible from the engine bay.
The idle control valve is mounted on the side of the throttle body. Carbon building up in the valve will cause the engine not to run properly.
with a motor dolley
its screwed in the right hand side of the engine
10W30 in the engine.