Aside from guessing that maybe the air vane is sticking, did you set the gap for the flywheel sensor? The fallback position would be backpinning the computer to scope the injector pulse and primary waveform to coil.
Since (I assume it is pulling strongly after stumble) it is not flattening out from 5.5k to 7k, I don't think it would be fuel supply/pressure related. Any valve float problems would be consistant and repeatable.
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