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I chased a similar flat spot problem for a few years. It only happened at wide open throttle and not every time. It was driving me nuts. After a while I ended up getting a pending code for the EVAP system. Come to find out my charcoal canister was plugged. Got a new used one from Woody. OMG no more flat spot!! So I would say EVAP system is something to take a closer look at.
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