This past week my 98 sls has died on three separate occasions whenever im rolling into a stoplight and start to brake, or when im at a stop sign. Whatever the case it happens when i start to slow down. Now my main concern is what could be causing this? I was thinking alternator but im not sure. It is very cold where i live so i try to warm up my car before i drive it. Also whenever i start my car i hear a loud whinning sound from under the hood. I noticed that it was comming from somewhere around the belt area on the left side of the engine. So if anyone could help me i would appreciate it alot.