claytonookie1

My 2004 S430 was hesitating at red lights to shift out of 2nd or 3rd gear? Then i got the pre-SAVE inactive msg. I was able to pull over each time and resart the car which worked (for a while). So i asked a mercedes mechanic to look at it and he hooked his scanner up to it etc to look at the codes. He was convinced it was a ecu/ecm problem. So i found one numbers matching on ebay and they said id probably have to take it to a dealership for reprograming since it came out of a 2004 CLK. ANYWAYS when i called the MB dealership they said you cant do that and that the vin numbers have to match etc etc? Then they proceded to tell me that it didnt sound like a ecu/ecm problem. They mentioned that it might be a transmission problem, but i dont speak mechanic and quickly forgot what exactly they said. Im supposed to take it in monday for them to take a look at it. Any help would be great! Im new to this forum and still figuring it all out.