Yes, I would check to make sure you have no leaks in any of the vacuum hoses, which induces extra air into the engine, causing RPM's to fall. A good way to check for leaks in the hoses is to (carefully) spray carb cleaner on the hoses and listen for a change in tone.
As far as idle control, it can be adjusted manually. I actually did this successfully yesterday. I have the shop manual and it says you have to get blanking hoses and whatnot for the idle air bypass hose, but this also works:
1.) On the top of the throttle body you will see a hole (possibly covered by an anti tamper plug) for the base idle adjuster. This is a metal plug that needs to be partially drilled with a self-tapping metal screw, which then can be popped off. This is so LR dealers can get more business...
2.) Remove the air bypass hose from the throttle body, which will cause the engine to speed up to 2500rpm or so. Unplug the connector to the idle motor after 5 seconds then reconnect the hose.
3.)Squeeze the hose shut with needle nose vise grips and adjust the base idle using an allen wrench to give an idle speed of 6-700rpm. Get the lowest speed you can that gives smooth running and does not stall when blipping the throttle. Screw clockwise for slower idle, counterclockwise for faster idle.
4.) Reconnect the idle stepper and remove the vise grip and you should be done.
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