993tt mystery engine events - advice appreciated

[bobt993]

You should be able to get a loaner and the associated immobilizer/key fob to pull codes using a hammer.  Any of the mentioned above can cause erratic power, stalling and sloppy throttle.  Moisture in the computer can cause this also if there was water in the back seat area at any time.  The ECU has a poorly designed back plane with a plastic insulator that if it gets any moisture causes erratic operation.  Your chasing a big loop of related parts and without fault codes it is a bit difficult figure out.  The NA 993 had harness issues that were a factory recall.  I am not sure if this affected the TT.

[size="3"]"10,300 U.S. and 455 Canadian 911 Carrera and 911 Carrera 4 vehicles [that] fall within the scope of this campaign.  Also, a total of 779 U.S. and 65 Canadian 911 Turbo vehicles are affected"[/size]

Have the VIN checked on your car for this issue and if the repair was done.  Harness is easy to change on a 993.