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Fun story:
I was doing the sunroof cables on a Tundra, so it spent a while with the battery unhooked. When I was done, hooked the battery back up, drove it out and job done.
Only, the carbon in the throttle was stopping the ECM from relearning the correct idle. It had learned from new and slightly drifted as the carbon built up over time, but there was too much of it to learn from zero. The truck didn't want to idle, bounced, stalled and bucked. One throttle cleaning and a reset of the adaptive memory and and it was as good as new on the first drive cycle.
FYI, having dealt with it last week on a 19 corolla, the correct idle matching procedure is (assuming the throttle body is clean): Reset the adaptive memory (disconnect the battery for DIYers), start the car, let it idle with no electrical load or AC until the ECT is above 80 degrees Celcius, then drive the car normally, putting it in neutral when coming to a stop and letting it idle 20 seconds.
Should be good after a few stops.
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