Another thought, you have got power to the idle cut off valve on the carb haven't you ?
Can you hear a click if you unplug it while the ignition is on ?

Jim


On 07/05/2016 11:57, Niall McCracken wrote:
James

Thanks for the offer that's very kind. But yes runs like a dream under load 
it's just on idle (or not being on idle!) that's the prob. Made some progress 
this morning though, bought some carb cleaner and started playing around - 
looks like there is a vacuum leak. It's either somewhere around the base plate 
under where the throttle mechanism goes into the body - or in the throttle 
mechanism itself. Can't be sure and now the car is overheating so I'll go back 
out in an hour and have another play!

Niall



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