My Turbo 2.9 idles beautifully for the first 30 seconds.. then starts hunting, then revs and drops right back.. I suspect the ECT may be an issue.. But on this car anything could be wrong..
What you realy need to do is get it full of water and then run it for half an hour, go through the rev range a few times to try and get some DATA into the ECU.
the full drive cycle for the ecu can't be replicated on a driveway as you will not get the full load data, but the ecu will be happier if it's had a bit more to learna bout.
TT
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