One of the most common failures that can cause this problem that I have seen before is the Torque converter solenoid (TCC solenoid). This solenoid can stay stuck on and cause the torque converter to stay locked up, this will cause the vehicle to stall whenever it is put into gear. The vehicle will start and run fine in park or neutral but will stall out as soon as it is put into gear. This is the most common failure that can cause this.
Also a malfunctioning idle air control valve can cause this, if the valve isn't moving or responding to bump up the idle when put in gear it may cause the vehicle to stall out, the computer commands this valve to allow more air in to bump up the idle to compensate the load on theenginewhen put in gear, if it isn't moving or isnt moving fast enough the idle may be too low and could cause the engine to stall out.Have also seen bad crankshaft position sensor cause this ,as well as mass airflow sensor's ,TPS - throttle position sensor's . Your best bet , take it to a qualified repair an have it diagnosed . No guess work .
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SOURCE: 302 engine starts fine but shuts off when put in gear to pull out.
check the idle air bypass solenoid
SOURCE: 1991 Ford Ranger starts but stalla when in gear.
Is this an automatic transmission? If so, is sounds like the TCC (torque converter clutch) solenoid is bad, causing improper locking and unlocked of the TC under load causing the engine to stall. It works like putting your hand up to stop a ceiling fan blade. Replace this and you should be good as new.
Good luck!
SOURCE: My 1994 ford rangers clutch pedal just lost all pedal
There are two types of clutch actuators. (Mechanical & Hydtraulic)
A. For mechanical type,- Check the clutch cable as
this could be cut from wear and tear. This is easy
to replace. You can find this connected to the
pedal and the clutch lever near the transmission.
B.For hydraulic operated - Check the level of the
hydraulic oil at the cylinder of the hydraulic
actuator under the hood. This actuator is
directly connected to the pushrod driven by the
pedal. If the actuator is leaking, you have buy
a repair kit (Hyraulic clutch repair kit for Ford
Ranger 1994 MOdel.) These items must be
repaired to activate your pedal.
SOURCE: 1989 ford ranger automatic transmission
Your truck has a A4LD transmission. The older ones had major problems. What i believe is happening with yours is the converter is locking up intermittently. 1st-4th are actual gears for 5th(overdrive) the converter locks. I had the same problem as well as did alot of people I spoke with. I solved it by getting a used A4LD out of a '92 ranger with a 3.0L motor (these transmissions had some upgrades to deal with a number of problems including the one you are talking about.) You will need to swap bell-housings (this requires the pump to be shimmed properly,I paid a shop $100 to install the pump ,with is attached to the back of the bell-housing) There are only 2 kinds of A4LD one for floor shift and 1 for column shift,make sure you get the right one.Good luck.
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You have a problem with the torque converter. It could be a torque converter clutch that is stuck due to a stuck TCC valve or a solenoid that is stuck energized due to failure or a wiring issue. I would suggest a dealer or transmission shop to diagnose.
also, when it stalls does it try and jump forward?
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