My 1998 SLK 230 Kompressor is acting weird. First, my gasoline tank gauge is not showing full when filled. It shows half full. Okay, I can live with that. Then the dreaded Check Engine light came on. My mechanic couldn't find a problem, but E10 showed up in the test, but he didn't know what it meant. Then, I was driving along and the radio quit and few minutes later the engine started idling really loud and died. After sitting a few hours I was able to drive it for a little while before the radio died and a few minutes later the car died again. I was able to get it to another mechanic who thought it was an alternator, but when he put it in that was not the problem. He is talking about bypassing something or other. Has anyone had this problem?