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The valve clearances would be my first port of call, depending on the severity of the tap its possible it could a little end. Very hard to be certain solely on a description. Irrelevant of vehicle age it shouldn't be tapping so something certainly a miss somewhere.
All good here thank you mate! Strange times but you've got to keep moving forward :) Are you still selling at the minute? Must be a strange time selling cars.
Stunning car and fantastic colour, the one and only petrol blue we have seen in our 14 year Birchdown history. Colour looks better in the flesh I must say.
Andy
Its a vac feed to the acoustic valve on the inner wing. Certainly cant see it being the cause of unstable idle. Has it had a cambelt recently? Belt timing is probably the biggest cause of unstable idling.