I would guess that it is a 94 4.0L Ranger. I would check to see if there are any codes in memory in the PCM. This is an EEC IV system and most Auto Zones and the like cannot read the codes in it. I would look at the idle air control motor to see if it is contaminated and needs to be cleaned. This can be cleaned with a good choke cleaner. The passages need to be sprayed until you remove most of the carbon. Check to see if you have blown a vacuum cap off the intake vacuum tree. Listen to see if you can hear a vacuum leak with the engine running. And bring back some more info on what you are driving.
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