Per AllData buy High Idle Service Kit from Ford part # xf1z-15k607-aa. Must splice into cable just before TPS (Throtle Possition Sensor) Conector. Low idle usually Idle Air solinoid. A vacuum leak can give you the same problem. Make sure you have none.
There is a heater control valve on the 1999 Ford Ranger. There is no thermal vacuum valve on this year of the vehicle.
The Idle Air Control (IAC) valve is mounted on the throttle body
I am in the process of replacing my valve for my 2000 Ford Ranger. When I pop the hood it is back and to the right and has a couple of hoses attached to it. If you buy the part it is really easy to identify it with the replacement part.
http://www.ecklerscorvette.com/corvette-hot-water-control-valve-for-cars-with-air-conditioning-1986-1987.html
If this happened all at once, check the vacuum lines. A cracked or broken line will cause high or rough idle.
Try your idle air control valve.
above the rear end on the drivers side
The idle adjustment screw of the idle control valve is what needs adjusting. Either opening or closing the valve moves the throttle plate and adjusts the idle.
There are a variety of different methods to accomplish a heart valve replacement, ranging from a pig valve to prosthetic valve replacement. The cost for the prosthetic valve replacement surgery, as of 2011, was $78,000.
On a 1996 Ford Ranger , 4.0 : The PCV valve is on top of the drivers side engine valve cover , near the rear of the valve cover
You can get a mitral valve replacement done at a surgical institute or hospital by a qualified surgeon. You can learn more about mitral valve replacement online at the Wikipedia.
egr valve location on a 1997 ford ranger 23l