Update: Data logging didn't turn up anything, so they ran a compression test today and compression tested fine in all cylinders. That's good news, but the crew at Dallas Mustang is pretty stumped as to what it might be at this point. My car already has the O-ring fix from the TSB, so they don't think the crank position sensor is involved. They're going to text the injectors tomorrow. Prime suspect at this point is the tune, but they're really just guessing right now.
Ruled out: Low compression, bad/dirty throttle body, coils, plugs, vacuum leak, O2 sensor.
Hope they find an answer soon.
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