Sometimes the 4wd light switch sticks. When this happens, the 4wd light on the dash will not kick on but yet the vehicle is in 4wd. My 1 4 runner does this from tome to time.
From what I gathered. It's fairly common and a replacement of the switch fixes it.
With yours being a limited, your actuator may stick as well. Which if fails will need replaced. Luckily they mostly just work.
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html