Gilly,

Sorry about the delayed response. I thought that I was subscribed to this thread but I wasn't.

No. The check engine light did not come on. As a note, I did find out that the vent hose issue had already been addressed according to TSB 2008020002. I'm anxious to hear what any of ya'll might have to say about this strange problem. I heard that there were problems with the valves on this motor that is remedies by changing the whole cylinder head. Any idea what the "signs and symptoms" are of this?

My 04/C230K run fine (no leak) went in for reg maintenance, they did this recall and less then a mile my car act just like yours. Turn out they did not properly done (vacuum leak/connection on the new/replacement hose). My point is you cannot just trust the check mark (done/performed) or record book/data anymore.

Thanks for letting me know. Even though they didn't do anthing to fix the issue because they couldn't replicate it, it is still running fine.

My husband was talking to the technician, and he did say that the way it would shake a few seconds then stop, then shake again (quite rhythmically) that it sounds like it might be the altinator clutch. Apparently, these cars have clutches on the altinator. Thought I'd mention that, too.

Good luck with yours... sorry they didn't fix the issue the first time.

We diagnosed the problem as being the altinator clutch. It was repaired last week, and is running beautifully. I didn't know it could run so smooth being it was new to me. Hope this finding helps others.