Your problem appears to be likely a vacuum leak or a dirty throttle body. Spray a throttle body/carb cleaner along all of your vac lines and listen for a change in RPM's, if nothing is found, then buy a new throttle body gasket(Less then 4 bucks from a dealership), remove the throttle body and the IAC from the TB and clean everything thoroughly. Pay attention to the IAC pintle and seat when cleaning as these are typically fouled with carbon deposits. Like Rick stated... once codes are cleared, it can take several drive cycles before a problem will reappear and be recorded.
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