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IACV"idle air control valve, often gets clogged and will serriously jack up engine performance., TPS "throttle positioning sensor" often misadjusted, tweaked and 100% of the time your engines worst nightmare.
CAS" cam angle sensor" you adjust for timing, a few degrees retard can horribly weaken throttle response and spool up. advancing a few degrees can gain response and spool. spark plugs are also a big WIN in the game of " what the fuck happened" haha so check those adn your coil packs as well.
hope i have contributed some help. all of what you have described ive had happen from multiple areas, but same outcome.
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