Okay get this every so often. Reminded me of the old coil pack failure. Essentially the car sudders, there's a loss of power, ECU light comes on, and then car sudden comes back to life. (all in the space of a matter of moments) Any one else had this? Its happens usually while on the throttle. Had audi tech check over the car, and he said no fault codes had been logged. SO he could not do do anything. He'd did mention about lamba sensor failures being common on the 3.2? And asked about what fuel I was running. Obviously I only run Optimax, but had tried Ultimate recently. Anyway it happened again yesterday - first time for a while. I am wondering if its down to 'off/duff' optimax from certain garages.