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I think I would be looking at your primary ignition side. Things like coil packs, plugs, TDC sensors and VANOS (cam)sensors. IF you loose one of those inputs the engine ECU will go nuts trying to maintian the idle.
What about grounds? Have you ever checked your engine ground? That would also cause the DME/ECU to have fits.
One thing you should do is check for DC voltage from engine ground to chassis gound/battery ground - WHILE starting the engine! You will need a peak/hold VOM, run some long leads from teh negative post on the batter and the other lead to the engine block (and then the other grounds in teh engine bay) start the engine... you should no more than 1volt! IF you have more than one volt while cranking... you have a bad ground(somewhere). Lots of techs forget that a bad ground can cause weird things. You can always just use a jumper wire as a temp ground for a week or so... to see IF that fixes your problem. Just make sure the wire is out of ways harm.
Also... tech 101... just because you replaced a part with a new part... DOES NOT mean that new part is a good working part! Sometimes you can get a bad part right out of the box!
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