When the engine is running at idle again after a spell of normal running it may be pulling more vacuum in the intake system and it may have a small air leak. When you start again and go straight to idle there will be less vacuum until you drive it a bit. This may indicate an air leak as mentioned. Yes, clutching at straws a bit so check all of the intake manifold nuts, especially if you have the alloy inlet manifold, and then the carb to manifold nuts. Don't go crazy, if the gaskets are good you shouldn't have to torque them up hard. New gaskets? Now there's a thought. Not a big job and not expensive.
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