Have you done the two most basic tests on these engines - checked the on/off ratio and measured system and control pressure? The first will tell you if the mixture is right and the mixture control system is OK, and the second will answer your question about fuel pressure.

How did you check the O2 sensor?

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe