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@Dammit
Air filter is brand new and we disassembled the entire intake system, checked for leaks, cleaned and reassembled it.
I agree- it feels like a hose sucking shut, but I don't think it can be, which is why my thinking is rather than being an intake issue it is an exhaust issue.
That said, if Mr Skuzzle pulls a tennis ball out of the throttle body tomorrow morning then happy days.