Advice on strange noise from engine bay

[Shinjuku79]

When car is sitting idling when fully warmed up, if then left for 10 mins, an airlike popping noise can be heard. This is both in consistent and fairly ramdom in occurence. Is is clearly audible but not loud.

Having investigated it appears as though this is coming from the throttle body -which twitches slightly when the noise occurs. When the electronic connector to the TB is disconnected the noise stops.

So before I look at replacing the TB it would be good if any of the mechanics or mechanically minded sorts could give a view on:
- confirm this is not a TADTS situation (it is something I heard by chance when idling the car but other than this there are no unusual symptoms and the car drives well)
- is this a known fault on the V8V - or is it one of those things and it's happened to me with this car
- anything I should check to make sure that "problem with the TB" is cause not symptom

Thanks
Shinjuku