[MatthewH]

Idle feels okay to me, maybe a very slight vibration but nothing I thought was worth mentioning. Certainly nothing like the vibration you get from a major vacuum leak (eg starting the car with PCV valve disconnected)

Intake manifold flaps seem okay. I replaced the linls a few months ago as they were broken, but the arms weren't seized. The arms are pulled back at idle, one opens up around 3000RPM and the other one opens at around 5000RPM. I filmed this while pressing the throttle to ensure they were working correctly.

I tested vacuum values a few months back. Can't remember the exact figure but I think it was 17/18. Seemed to be on the low side but I read online that it's just about acceptable. I've replaced several hoses and gaskets since taking this reading so it may not be this low now. I'll take another reading tomorrow morning.

Cambelt was apparently done at 130k miles according to the service book (not at Audi). I bought the car at 140k miles. I'm not sure about the cam sensors - I'll have a look. If the belt was fitted a tooth or 2 out could it cause these symptoms? Any way to check this with VCDS?

Thanks