I owned a 02 C32 AMG and it had very very similar problems. It was narrowed down to too short of a wiring harness that became disconnected, bad connection when the motor rocked during hard acceleration. I had that particular car lemoned out because this incident happened to me about 6 times. The 03 they gave me did it to me too, at 500 miles!!!

Do you know the details of the "They have narrowed it down to a wire harness or computer"? was the harness too short?

Chris