Help With My '89 300CE

[buzzie]

In January I bought an '89 300CE - which I love! About April I started having problems with it dieing at a stop - it would just loose power and be difficult to restart. I took it to the "local" MB dealer (70 miles away) and they replaced the fuel pump relay. I then drove it from Arkansas to California with no problems. However, when I got home the problems started all over again - at a stop shuddering loosing power all warning lights coming on and dieing - and it was getting harder and harder to restart, but once it was restarted it would run perfect for a week or so. 'Bout the third time this happened after my return from California I had it towed to the dealer. They claimed it started right up for them and they couldn't duplicate the problem I was having - so they replaced the crankshaft sensor. Drove fine for about a week -then I didn't drive it for a week because of the weather - tried to start it last Sunday - nothing it won't start at all now - it turns over - makes a "popping and hissing noise", least that's what it sounds like to me, but won't start.

I have to admit I am "mechanically challenged" - so what I would like from ya'll is a list to take to my MB dealer and say "I want you to check x,y and z. Please... The dealer claims the codes come back fine, and starts and runs everytime for them. ALSO, while trying to replace the bulb in my third brake light the service tech broke the housing - they say they cannot find another to replace it - can anyone help me locate one?

Thank you for all your time and effort.