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Have you pulled the codes to see if anything is stored? That's usually a good start. Might try cleaning your Mass Air Flow (MAF) and your Idle Air Control (IAC). If these aren't responding correctly it may be leaning out when you punch it.
Since it is popping and lacking power under sudden acceleration under load but accelerates OK when not loaded, my thought is that it may be slightly fuel starved. Like if the IAC is open for Idle and doesn't close quick enough, or if the MAF response is just slow.
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