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  1. 7

    double RPMs on 1987 Buick t-type

    tach is stock
  2. 7

    double RPMs on 1987 Buick t-type

    The tachometer is reading double RPMs. After changing the ECM and the spark control module. Tried a different ECM also different spark control module. I am asking this for my brother, any help would be appreciated.
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