This code can be hard to diagnose, have you searched it on BB?
Other items to check would be fuel pressure and flow. Unlikely a plugged filter, but a bad FPR, although usually fails rich.
ALso I'd check the volts from the O2 sensor, just to see how it reads. A bad one will not cause the problem you have, but it would be good to see if it agrees with the lean hypothesis.
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84 242Ti IPD bars&springs, 89 745 16v M46 IPD bars, 89 744 16v M46 IPD bars, 93 945 Turbo AW71, 91 245SE AW70 IPD bars, 93 245 CLassic M47
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