One problem related to crankcase (pcv) has been reported for the 1999 Ford Ranger. The most recently reported issues are listed below.
The throttle gets stuck intermittently. It doesn't matter if the air conditioner is on or off or the weather conditions. Dealership has not checked the vehicle. However, other mechanics have looked at it but could not seem to pin point the problem, but suggested to replace the pc valve and the filter. Consumer replaced them.