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searching idle

  1. Temp gauge, maybe more?

    3.7L Slant 6 Specific Topics
    I have an '86 W100. I replaced the coolant temp sensor because the temp gauge was not working. Now it works, but only when the key is in the start position. It also has a searching idle, sometimes high, sometimes low, and backfires frequently when cold. All of this makes me think that the...
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