This is frustrating. Last year the car always started perfectly from cold with a smooth fast idle settling down to 800 rpm once warmed. Since the usual winter layup however it has been running like a bag of nails on cold start, as if only one carb is functioning correctly. Nothing can mysteriously just gone out of adjustment sitting in the garage and the fuel tank was filled with new fuel and Stabil stabiliser added so it's not bad fuel (that would affect both carb's anyway). Once warmed up it settles down to the correct smooth idle. What are the steps I should take to check the cause of the poor cold running ?. I really don't think it's a major strip down problem as all was perfect prior to the layup, and I have been running it up to temperature periodically during the winter despite the cold running issues so it hasn't been lying dormant for months on end. I'm just looking for a methodical approach to identifying and rectifying the problem as opposed to blindly stripping everything without needing to.
I should add this is a standard UK car.
I should add this is a standard UK car.