You don't say you replaced the airflow meter potentiometer. One of it's functions is signalling the ECU the need for enrichment during sudden changes in airflow - such as opening the throttle. It develops wear spots from the slider contact, causing hesitation at certain spots, and often a hunting idle too.
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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