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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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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