As I said originally, I fitted a new hose from the carb to the servo and when the engine was racing I put my finger over the hole and it didn't reduce the revs so nothing to do with the servo. I have checked the distributor and it springs back fine but it will continue to go a bit more after it has sprung back but it does that whether hot or cold so that's not the problem. So I think it's back to an air leak somewhere between the carbs and the cylinder head. Will continue to
Look. Thanks for the replies.
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