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Re: idles to fast
I would look for a vacuum leak. If you stand outside the car with the hood open while the car is running you might be able to hear which vacuum hose is leaking. Considering the age of that car I would have a very good look at any vacuum hose or the hose going to the power brake booster (if the truck has power brakes)
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the engine computer is rasing the idle speed when ever the a/c compressor starts to operate. So it is adding too much air and therefore fuel. The duty cycle of the fast idle solenoid or compensator is off. Check the idle air controls.
I figured out what was going on. supposedly on ford rangers the Idle Air Control Valve (IAC Valve) goes bad. i got a trouble code looked it up and sure enough it is the IAC Valve. Under 100 bucks for the part