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I've found critter nests in the air box a couple times with parked cars. They chewed up the firewall and filter which had to be vacuumed out. Put on metal screen and problem solved.
The “system adaption” advice above sounds right. OBD2 drive cycles must all complete to pass smog. They self-tune both the idle speed and fuel curve to get the engine burning clean. Stalling is a symptom after battery change.
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Meanwhile other things are still happening.
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