I had a similar problem with the solution being the fuel pump.

There are two tests to look at fuel pump fitness: Fuel pressure and fuel volume. Could be your pump is delivering adaquate pressure but cannot keep up with demand.

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R. Downs
1985 500SEL (260,000 miles) SOLD!
1974 280 SOLD!
1994 Volvo 850 Turbo Wagon (Yuppie Ice Sled)

"I know I have a Benz and they know it too." If you start bragging about it or shoving in people's face, you then become a Wally; especially to the girls.