My car is a 1984 300D turbo with just over 300,000 miles, just recently the idle has been getting worse. its kinda rough at times with some hiccups, when I had the a/c on tonight it was shaking the whole car while stopped in drive and later on it stalled on me. I've put about 10,000 miles on it since I've owned it and never done a valve adjustment, set the timing or cleaned the tank screen. Am I just in need of a good tune-up?

here is my slow 0-60 run

http://www.youtube.com/watch?v=M1YzijgGfpA