Right... I cant see how it would have bumped out of adjustment either, and I suspect the others are right on the fuel delivery suggestion, but just wanted to share my own experience. In my case, I was at fault. I fiddled with the adjuster w/o knowing what the hell it was. Last time i'll do that! It took me more than a month of driving the world's slowest 300D before I figured it out.

Again, good luck!

Chris