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      Sam Cooper replied to the thread Ignition timing.
      My 89 C3500 with 7.4 L big block has an interesting issue. Lately it has started throwing a code 44 lean condition SES. The idle was...
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      Sam Cooper replied to the thread Sensor identification help.
      Okay I just tried to make myself crazy on this one. I have a 1989 big block powered C3500. Apparently the original sensor was a GM...
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