Well my mechanic, did fix my problem. First he change the fuel pump relay. but the car still die on me at slow speed when car is in gear. Than I took back and my mechanic fix it. I ask him what cause the problem but he didn't tell me. He said it was something really simple and he didn't charge me. My Mercedes specailist mechanic is called RUSTY and is located in Arcadia, Los Angeles. He is really good, and recommended to anyone in this area with MB problems.