Pull your plugs and see if they all look the same, too -- if you have a bad injector or two, they could be flooding fuel in unwanted.

probably the o2 sensor, though....

Change the oil pronto -- if you can smell gas in it, it's too thin.

Peter

__________________
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!