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Petronous,
The O2 sensor is located behind the left rear tire. A little shield should be attached to it to protect the rear tire. If your car was delivered with an O2 sensor, disconnecting it will make the engine run rich (and not in good way either). The O2 sensor is used to control mixture and has nothing to do with ignition or "cut outs". The O2 sensor is not used in full throttle operation.
I could write a Motronic FI trouble shooting checklist but I don't have time right now.
Because it is easy, I would start by testing whether the head temperature sensor is causing the problem. The head temp sensor is the white connector at the top of the 3 connector set on the left top of the engine, just to the left of the heater blower.
Run the car to operating temp and turn the motor off. Insert a 3-700 ohm resistor into the connector going to the car. Put a piece of tape over it to hold it. Drive the car and see if that fixes the problem.
-Chris
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