Hurray! After all of my parts replacements and thread reading, I have finally got my 300E with 180,000 Miles to idle nice and smooth!!! For my car the Lambda setting was misadjusted by someone else for I don't know what reason. I had been trying to adjust it with the air housing off (because I didn't have a long enough hex wrench) until I read a thread last night that said it had to be on due to the air cover temperature sensor sending signals to the computer. I did the adjustment (richer for me..clockwise) and now the thing feels like it's off when I'm in the car (well, maybe a very slight little tingle when at a stop). I hope when the warmer weather returns, it stays the same. I did wait until it reached operating temperature of 80C. And I adjusted without equipment so it might not be a perfect mixture setting. For now, I'm pumped! Thanks for everyone's help! Great forum!!!