Thanks for the input!

The numbers were at actual idle, and my idle was stumbling a bit. I just replaced the spark plugs with the correct NGK ones and it idles smoothly now.

Should my reading by taken at ~1500rpm? If so then I'm probably undercharged.

With domestics, I'll usually raise the rpm on small cars but I wasn't sure if I should on the w201. Domestics tend to be more forgiving with their large accumulators taking up a lot of slop.

Thanks again.

(P.S. Who decided to put the high side port where it is? Geeze?)

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1997 E300 Diesel - 222K miles