Removing power resets the computer, and now it thinks the engine is brand new again. When the engine doesn't want to idle after a reset, there is probably gunk on the throttle plates, throttle body and idle air control passages. It wouldn't hurt to clean those.
Idle speed is controlled with bypass air through the throttle body, controlled by the idle air control valve (IAC). Gunk collects restricting this air flow, and idle speed. You might try slightly pushing the throttle to raise idle speed above normal, then slowly let off to see if the computer takes over, then let it idle on it's own for several minutes to relearn.
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