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leave the hubs unlocked unnless you are going into terrain that would require 4x4, then you may lock them in and run the truck in 2x4 until you press the 4x4 button, this wll lock the T/C and give you 4 hi, stop, shifter in N and foot on brake, button to 4 low and viola you are in 4x creep mode.
I have a 92 Explorer with auto hubs and a 94 Ranger with manual hubs. They have an identical drive train except the Rangers drive line is longer.(I haven't checked yet if the axle ratio is the same!) Anyway, I suspect the Ranger came with auto hubs which were replaced with the manual hubs before I bought it. I've heard the auto hubs will fail after awhile, and the manuals are way more reliable. I haven't had any problems with either, but I make sure the auto hubs are greased sparingly. Too much grease was their main problem. If I need 4WD, it's nice to just push the button with the auto hubs, and everything comes on. With the manual hubs, I have to set them before I start out. This will cause the front axle and drive line to rotate, but the transfer case isn't engaged until I push the button inside. Follow the owners manual guidelines for engaging (and disengaging) the 4WD.
As for the idling issue, when I bought the Ranger it had idling issues too. Once it got moving down the road, the throttle was very erratic. I did not have a check engine light. A KOEO and KOER test revealed a Throttle Position Sensor (TPS) bad. Pull the codes and you may find your problem. Hope this helps.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.