Welcome to the club :). I assume when you say gear oil, you mean the diff oil too? If not, that's worth doing.
When your timing belt is done, in my opinion, you may as well get the water pump changed.
Idle air control valve might be worth looking at, may a bit sticky and need a clean or just adjusting slightly. Simple enough to do, warm the car up, undo the two screws on top of it and it will twist slightly, one way will turn the idle up, the other down.
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