You should remove inspect and clean the idle control valve on the throttle body. This can become clogged over time, or the motor itself can become worn and may need replacing.
SOURCE: 1990 toyota 22re high idle and surge between shifting
You have extra air leaking into the intake manifold that mimicks a throttle that is open further than it really is. Check for vacuum leaks.
SOURCE: Loping and high idle
You are really onto it! Either the TPS or the cable from the peddle. Do check the cable first. Frankster016
SOURCE: 1993 toyota 4x4 idle problem
sounds like your throttle positioning sensor is not set right so i would undo the two phillips heads that hold it and turn it till the idle doesnt fluctuate should be turned most of the way to the front of the truck. Also check your idle screw that throttle body could be set different.
SOURCE: at idle , the rpm fluctuates and speed go down and
Could be a dirty throttle body or low coolant, bad coolant sensor, throttle sensor, or idle speed motor
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SOURCE: My car shakes at idle speed of 800 rpm, doesn't
old engine mounts can cause that problem, even if they look ok sometimes
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