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Hi- my 05 has just started making a sound like feedback from a microphone. It happens when I accelerate from a stop, but not every time, and lasts 2-3 seconds. It is VERY loud and I think is coming from the back somewhere. It doesn't make this noise when I have a car full of people. Any thoughts? Recently had a 100k service (at 96K) as we had a bad throttle body valve.