Douglas:

Sounds as if you have open vents on the carb, and the gas is all evaporating! More of a problem now that it used to be, since the gas is a bit more volatile. Common problem on pre-emissions control carbs, by the way.

No need to replace the jets, the are just an orifice, and if the car runs well at speed, they are fine. I would replace the accelerator pump seals and etc, though.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!