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well, no codes is an indicator - how can something like this happen, but fool the dme such that it doesn't throw a code? dme knows what it knows from sensors - o2, tps, temp, rpm, etc. for example, if the throttle plate is flapping around while the car is in open loop, there would be no signal back to the dme outside of a random misfire (open loop so no o2 sensor, and tps, etc., would all be reading ok; only issue would be misfire/knock from super lean condition).
dme switching between open and closed loop at idle is an odd thing too - at idle it shouldn't be in either - it should be working off the idle maps. so, for some reason the dme didn't think the car was idling - again, i'd look at sensors.
personally, i'd check throttle body, throttle cable, throttle position sensor. perhaps map them to see what signals you are getting. or some old oil crudding up the throttle plate? but really, i have no real clue - i'm just throwing ideas at you.
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