[V8] Irregular idle, stalling and balking when pressing accelerator

[Peter Green]

Well.... after almost four years of trouble free service the Audi gremlins are out to get me.  My problems started when I noticed a larger than normal volume of white exhaust in the cold air.  Having dutifully read my 'audifans' e-mails my immediate conclusion 'time to change my O2 sensor'!   I took it to my mechanic who replaced the unit with a Bosh unit which he spliced into the wiring harness, at the same time he mentioned my Air Temperature sender was getting to the outer edge of it's range.

When leaving the garage I noted balking when the accelerator was depressed, but then it 'went-away' so I thought I would mention it when taking the 'Pearl' back for the Air Temperature sensor.  During the past week the car has stalled at lights a couple of times - restarting immediately (with the key) and balks when I try to overtake.  After stopping and restarting, the engine seems to run fine for some time before the problem re-occurs.

Any suggestions, recommendations (other than sell my 'pearl') would be gratefully received.