So to re-cap, you've got a rough idle and your car wants to die everytime you come to a stop? Sometimes it starts right up after dying, other times it doesn't; is there any connection to how long you've been driving the car or it's operating temp when it comes to the difficulty you have re-starting it?

Does the rough idle occur regardless of operating temp? In gear or out?
What's the ambient temperature where you're at?
What do your plugs look like? White & ashy or black & sooty?
Have you tested your throttle position sensor?

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.