Sounds like a common wiring harness or throttle actuator issue to me.

How many miles and what's the overall condition? How much were you thinking to sell the car for?

__________________
1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!