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Of items previously mentioned, I would pay particular attention to the AFM potentiometer. Enrichment during rapid change in airflow demand is its primary function. If you are not getting any of the other symptoms of wear or malfunction - erratic idle, etc - then it may just need adjustment (rotation). Monitor its function by monitoring the center pin voltage - it should meet calibration value at idle, and change smoothly but rapidly under a throttle stomp.
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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