Don't know about the 300, but just changing little things like the linkage lengths made big differences on my 240d. As this is basically my first car ever (had the other one two weeks in '84) it's a little daunting the range of things that affect the performance, the timing chain, the IP calibration, fuel delivery, compression, air mix, and so on. Just glad I've got stick. But I think if you stick it out and do a systematic attack on it, taking notes and pics on everything you can eliminate all least the easy posibilities.
P.S. All hail the forum for making my biofueled return to driving do-able
bonus pic
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