I had a buddy that put about 2k miles on his car after a good rebuild and he had those EXACT same problems, just on the dyno. Turns out his plugs were super shot. They'd heat up and misfire. Changed em out on the dyno and bam, problem solved.
EDIT: I just read that it has 2k miles on it also. Change them out anyway. Rebuilds kinda like to kill their first set of plugs and I have no idea why.
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