When I first got my 500SEC I chased this problem for months, spending probably nearly a thou on parts and labor at my indie, changing dist cap, wires, plugs and other things.

One day I was griping about it to an older gent who had made his living working on benzes when this car was new, and he said....."always push the gas pedal down about half way on startup on those cars".

I did that and also developed the habit of never shutting the car off when going into the village pantry to get a news paper or such and lived happily ever after. It was bleeding fuel into the intake on shutoff and when you restarted it the fuel would make it run rich and stumble until you revved the engine up and blew it out.

I never fixed the problem but it never got worse either. I drove the car sixty thousand miles that way. It ran strongly and smoothly in every other way.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.