Cold Start - When car sits 6 to 8 hours runs bad and tries to go dead. After a few minutes it straightens up and runs fine. Please give advise. Has new fuel filter, spark plugs and have tried different types of fuel. Thanks for any help.

those engines are notorius for valve seal and valve problems. I am assuming you have a newer c class with the 271 kompressor engine.

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Dr.Diesel -
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Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?

based on your short description, it sounds like you coolant temp sensor is bad